Orrery - Revision history

kenyoung: Added info about creating comet ephemeris

2012-10-29T22:07:43Z

Added info about creating comet ephemeris

← Older revision		Revision as of 22:07, 29 October 2012
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	The To-scale Solar System page shows the orbits projected onto the Solar System's equatorial plane. Since comets follow paths that are often very highly inclined to that plane (as is the case for comet Pan-STARRS), this projection effect can make it look like the Sun is not at the focus of the orbit, but of course it must be. This is merely an illusion.		The To-scale Solar System page shows the orbits projected onto the Solar System's equatorial plane. Since comets follow paths that are often very highly inclined to that plane (as is the case for comet Pan-STARRS), this projection effect can make it look like the Sun is not at the focus of the orbit, but of course it must be. This is merely an illusion.
		+
		+	===== Adding Additional Comets =====
		+
		+	You can add more comets for the orrery to display. To do so, you need to create an ephemeris file. The file must have the following format:
		+
		+	The first line must contain the name of the comet, optionally followed by a second "nickname" for the comet.
		+	All other lines must be formatted as follows:
		+	Character Range Description
		+	0 -> 3 Year (2012, etc)
		+	5 -> 7 Month (Jan, Feb, etc)
		+	9 -> 10 Day of month
		+	12 -> 13 Hour
		+	15 -> 16 Minute
		+	18 -> 28 Geocentric RA (HH:MM:SS.SS)
		+	30 -> 40 Geocentric Dec (+DD:MM:SS.SS)
		+	43 -> 47 Magnitude (MM.MM)
		+	49 -> 56 Ecliptic Longitude (DDD.DDDD)
		+	58 -> 65 Ecliptic Latitude (+DD.DDDD)
		+	67 -> 79 Distance from Sun (AU)
		+
		+	This information can be easily obtained from the JPL Horizons website. For the ephemerides I include with the package, I have one entry for every time the comet moves by one degree in the sky, so the sampling is much finer near perihelion. The file must be placed in the directory /opt/maemo/usr/share/orrery/comets/ . The name of the file does not matter.

	=== Displayed Items ===		=== Displayed Items ===

kenyoung: /* Comets */

2012-10-28T13:09:37Z

Comets

← Older revision		Revision as of 13:09, 28 October 2012
Line 290:		Line 290:

	In addition to the Comets page, comet information shows up several other places. The comet will be plotted on the sky map page (default page) if showing comets has been enabled via the Displayed Items menu page. Comets will also be shown on the Planet Compas page, the Planet Elevations page and the To-scale Solar System page. Note that if their are comets visible, there will be a button in the upper left area of the Planet Elevation page allowing you to toggle between showing planets and showing comets.		In addition to the Comets page, comet information shows up several other places. The comet will be plotted on the sky map page (default page) if showing comets has been enabled via the Displayed Items menu page. Comets will also be shown on the Planet Compas page, the Planet Elevations page and the To-scale Solar System page. Note that if their are comets visible, there will be a button in the upper left area of the Planet Elevation page allowing you to toggle between showing planets and showing comets.
		+
		+	The To-scale Solar System page shows the orbits projected onto the Solar System's equatorial plane. Since comets follow paths that are often very highly inclined to that plane (as is the case for comet Pan-STARRS), this projection effect can make it look like the Sun is not at the focus of the orbit, but of course it must be. This is merely an illusion.

	=== Displayed Items ===		=== Displayed Items ===

kenyoung at 06:45, 28 October 2012

2012-10-28T06:45:03Z

← Older revision		Revision as of 06:45, 28 October 2012
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	At the bottom of the eclipse display page a map is presented showing the portions of the earth which can see the eclipse. The observer's location is indicated with a red dot, and the map itself is centered at the longitude of the observer. The light blue dot shows the position on the earth for which the moon is at the zenith at the moment of maximum eclipse. The light blue line shows the longitude for which the moon is on the [[:wikipedia:Meridian_(astronomy)\|meridian]] at the moment of maximum eclipse. The darkest grey region shows the portion of the earth for which none of the eclipse can be seen. Observers in the white region can see at least some portion of the maximum phase of the eclipse. In other words, if the eclipse is total, an observer in the white region sees at least some part of the total phase of the eclipse. If the eclipse is partial, an observer in the white region sees a partial eclipse. Other shades of grey are used for regions that, for example, can only see the partial phases of a total eclipse. The next image to the right indicates the meaning of the various shaded regions and lines on this eclipse visibility plot.[[Image:OrreryLunarEclipseMapKey.png\|thumb\|200px\|alt=Lunar Eclipse Visibility Plot\|Lunar Eclipse Visibility Plot]]		At the bottom of the eclipse display page a map is presented showing the portions of the earth which can see the eclipse. The observer's location is indicated with a red dot, and the map itself is centered at the longitude of the observer. The light blue dot shows the position on the earth for which the moon is at the zenith at the moment of maximum eclipse. The light blue line shows the longitude for which the moon is on the [[:wikipedia:Meridian_(astronomy)\|meridian]] at the moment of maximum eclipse. The darkest grey region shows the portion of the earth for which none of the eclipse can be seen. Observers in the white region can see at least some portion of the maximum phase of the eclipse. In other words, if the eclipse is total, an observer in the white region sees at least some part of the total phase of the eclipse. If the eclipse is partial, an observer in the white region sees a partial eclipse. Other shades of grey are used for regions that, for example, can only see the partial phases of a total eclipse. The next image to the right indicates the meaning of the various shaded regions and lines on this eclipse visibility plot.[[Image:OrreryLunarEclipseMapKey.png\|thumb\|200px\|alt=Lunar Eclipse Visibility Plot\|Lunar Eclipse Visibility Plot]]
	{{clear}}		{{clear}}
		+
		+	{{clear}}
		+	==== Comets ====
		+
		+	The Comets page displays information about any [[:wikipedia:Comet\|comet(s)]] that the app knows about. An example of the display produced is shown on the right.[[Image:orreryCometPage.png\|thumb\|200px\|alt=Comets Page\|Comets page]] Information for comets which are currently below the horizon is shown in grey (as is the case for comet [[:wikipedia:C/2011_L4\|Pan-STARRS]] in the sample page).
		+
		+	Unlike the major planets, comet information for orrery is obtained from
		+	[[:wikipedia:Ephemerides\|ephemerides]] obtained from the [[:wikipedia:JPL_Horizons\|JPL Horizons website]]. Ephemerides are used for comets because their orbits may be strongly perturbed by the major planets as the comets move through the inner Solar System. Since ephemerides are used, the orrery can only display information for a comet during the period covered by the ephemeris, usually one year before and after the periheion passage. Outside of that period the comet is ignored and not plotted anywhere.
		+
		+	In addition to the Comets page, comet information shows up several other places. The comet will be plotted on the sky map page (default page) if showing comets has been enabled via the Displayed Items menu page. Comets will also be shown on the Planet Compas page, the Planet Elevations page and the To-scale Solar System page. Note that if their are comets visible, there will be a button in the upper left area of the Planet Elevation page allowing you to toggle between showing planets and showing comets.

	=== Displayed Items ===		=== Displayed Items ===

kenyoung: CHanged version number

2012-10-28T06:12:44Z

CHanged version number

← Older revision		Revision as of 06:12, 28 October 2012
Line 1:		Line 1:
-	The orrery is a simple open-source application for [[Open development/Maemo roadmap/Fremantle\|Maemo 5]] which displays the night (and day!) sky. It is nowhere near as elaborate as, for example, kstars, xephem or stellarium. It is intended to be a small, finger-friendly application, requiring no network connection. The current stable version is 3.7.x (the x just increments when bugs are fixed). The program version is shown on the "Symbol Key" page.	+	The orrery is a simple open-source application for [[Open development/Maemo roadmap/Fremantle\|Maemo 5]] which displays the night (and day!) sky. It is nowhere near as elaborate as, for example, kstars, xephem or stellarium. It is intended to be a small, finger-friendly application, requiring no network connection. The current stable version is 3.8.x (the x just increments when bugs are fixed). The program version is shown on the "Symbol Key" page.

	The source code is hosted on [https://github.com/kenyoung/orrery this github repository]. The version there may not have gone through the Maemo Community QA testing. The most recent version which has been vetted by the community is available in the Maemo [[Extras]] catalog. This wiki page describes the behavior of the version of the program available in the Extras Devel catalog.		The source code is hosted on [https://github.com/kenyoung/orrery this github repository]. The version there may not have gone through the Maemo Community QA testing. The most recent version which has been vetted by the community is available in the Maemo [[Extras]] catalog. This wiki page describes the behavior of the version of the program available in the Extras Devel catalog.

kenyoung: /* Lunar Eclipses */ Added a clarification

2012-05-29T00:07:06Z

Lunar Eclipses: Added a clarification

← Older revision		Revision as of 00:07, 29 May 2012
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	{{clear}}		{{clear}}
	==== Lunar Eclipses ====		==== Lunar Eclipses ====
-	The orrery can display information about every [[:wikipedia:Lunar_Eclipse\|lunar eclipse]] occurring from from 1999 BC through 3000 AD - a bit more than 12000 eclipses (the database used is the "Five Millennium Canon of Lunar Eclipses: -1999 to +3000" available at http://eclipse.gsfc.nasa.gov/SEpubs/5MCLE.html, although the orrery generates its own maps). It will display information about the visibility and duration of the eclipse as seen from the current location. When one selects the Lunar Eclipse page, the checklist page shown on the right is presented.[[Image:OrreryLunarEclipsePage1.png\|thumb\|200px\|alt=Selection page for Lunar Eclipses\|Selection page for Lunar Eclipses]] Because so many eclipses can be displayed, by default the user is presented with a small subset of the eclipses: those which occur during the next 10 years. One may change the starting and ending years to access other eclipses. The "List only eclipses visible from here" checkbox allows you to produce a list of only those eclipses for which at least some portion of the eclipse is visible at your location. Other checkboxes allow you to decide which types of lunar eclipses; penumbral, partial and/or total, you wish to display. By default [[:wikipedia:Lunar_Eclipse#Types_of_lunar_eclipse\|penumbral]] eclipses are not displayed, because they involve only a rather subtle changing of the moon's illumination. If you change any of the selection criteria on this page, you need to tell the program to generate a new list of eclipses to display by pressing the "Rebuild the Eclipse List" button. If you don't change the checkboxes, you do not need to push that button. To select the eclipse you wish to observe, click the "Click Here to Select the Eclipse to Display" area, and you will be presented with a scrollable list of eclipses to choose from.	+	The orrery can display information about every [[:wikipedia:Lunar_Eclipse\|lunar eclipse]] occurring from from 1999 BC through 3000 AD - a bit more than 12000 eclipses (the database used is the "Five Millennium Canon of Lunar Eclipses: -1999 to +3000" available at http://eclipse.gsfc.nasa.gov/SEpubs/5MCLE.html, although the orrery generates its own maps). It will display information about the visibility and duration of the eclipse as seen from the current location. When one selects the Lunar Eclipse page, the checklist page shown on the right is presented.[[Image:OrreryLunarEclipsePage1.png\|thumb\|200px\|alt=Selection page for Lunar Eclipses\|Selection page for Lunar Eclipses]] Because so many eclipses can be displayed, by default the user is presented with a small subset of the eclipses: those which occur during the next 10 years. One may change the starting and ending years to access other eclipses. The "List only eclipses visible from here" checkbox allows you to produce a list of only those eclipses for which at least some portion of the eclipse is visible at your location. Other checkboxes allow you to decide which types of lunar eclipses; penumbral, partial and/or total, you wish to display. By default [[:wikipedia:Lunar_Eclipse#Types_of_lunar_eclipse\|penumbral]] eclipses are not displayed, because they involve only a rather subtle changing of the moon's illumination. If you change any of the selection criteria on this page, you need to tell the program to generate a new list of eclipses to display by pressing the "Rebuild the Eclipse List" button. If you don't change the checkboxes, you do not need to push that button. '''To select the eclipse you wish to observe, click the "Click Here to Select the Eclipse to Display" area''', and you will be presented with a scrollable list of eclipses to choose from. You will not be presented with an eclipse list unless you click in that region (shown outlined in red, in the screenshot to the right).

kenyoung: /* Lunar Eclipses */

2012-05-27T05:08:43Z

Lunar Eclipses

← Older revision		Revision as of 05:08, 27 May 2012
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-	At the bottom of the eclipse display page a map is presented showing the portions of the earth which can see the eclipse. The observer's location is indicated with a red dot, and the map itself is centered at the longitude of the observer. The light blue dot shows the position on the earth for which the moon is at the zenith at the moment of maximum eclipse. The light blue line shows the longitude for which the moon is on the meridian at the moment of maximum eclipse. The darkest grey region shows the portion of the earth for which none of the eclipse can be seen. Observers in the white region can see at least some portion of the maximum phase of the eclipse. In other words, if the eclipse is total, an observer in the white region sees at least some part of the total phase of the eclipse. If the eclipse is partial, an observer in the white region sees a partial eclipse. Other shades of grey are used for regions that, for example, can only see the partial phases of a total eclipse. The next image to the right indicates the meaning of the various shaded regions and lines on this eclipse visibility plot.[[Image:OrreryLunarEclipseMapKey.png\|thumb\|200px\|alt=Lunar Eclipse Visibility Plot\|Lunar Eclipse Visibility Plot]]	+	At the bottom of the eclipse display page a map is presented showing the portions of the earth which can see the eclipse. The observer's location is indicated with a red dot, and the map itself is centered at the longitude of the observer. The light blue dot shows the position on the earth for which the moon is at the zenith at the moment of maximum eclipse. The light blue line shows the longitude for which the moon is on the [[:wikipedia:Meridian_(astronomy)\|meridian]] at the moment of maximum eclipse. The darkest grey region shows the portion of the earth for which none of the eclipse can be seen. Observers in the white region can see at least some portion of the maximum phase of the eclipse. In other words, if the eclipse is total, an observer in the white region sees at least some part of the total phase of the eclipse. If the eclipse is partial, an observer in the white region sees a partial eclipse. Other shades of grey are used for regions that, for example, can only see the partial phases of a total eclipse. The next image to the right indicates the meaning of the various shaded regions and lines on this eclipse visibility plot.[[Image:OrreryLunarEclipseMapKey.png\|thumb\|200px\|alt=Lunar Eclipse Visibility Plot\|Lunar Eclipse Visibility Plot]]
	{{clear}}		{{clear}}

kenyoung: Added wikipedia links to explain some eclipse-related terms

2012-05-27T05:02:29Z

Added wikipedia links to explain some eclipse-related terms

← Older revision		Revision as of 05:02, 27 May 2012
Line 269:		Line 269:
	{{clear}}		{{clear}}
	==== Lunar Eclipses ====		==== Lunar Eclipses ====
-	The orrery can display information about every lunar eclipse occurring from from 1999 BC through 3000 AD - a bit more than 12000 eclipses (the database used is the "Five Millennium Canon of Lunar Eclipses: -1999 to +3000" available at http://eclipse.gsfc.nasa.gov/SEpubs/5MCLE.html, although the orrery generates its own maps). It will display information about the visibility and duration of the eclipse as seen from the current location. When one selects the Lunar Eclipse page, the checklist page shown on the right is presented.[[Image:OrreryLunarEclipsePage1.png\|thumb\|200px\|alt=Selection page for Lunar Eclipses\|Selection page for Lunar Eclipses]] Because so many eclipses can be displayed, by default the user is presented with a small subset of the eclipses: those which occur during the next 10 years. One may change the starting and ending years to access other eclipses. The "List only eclipses visible from here" checkbox allows you to produce a list of only those eclipses for which at least some portion of the eclipse is visible at your location. Other checkboxes allow you to decide which types of lunar eclipses; penumbral, partial and/or total, you wish to display. By default penumbral eclipses are not displayed, because they involve only a rather subtle changing of the moon's illumination. If you change any of the selection criteria on this page, you need to tell the program to generate a new list of eclipses to display by pressing the "Rebuild the Eclipse List" button. If you don't change the checkboxes, you do not need to push that button. To select the eclipse you wish to observe, click the "Click Here to Select the Eclipse to Display" area, and you will be presented with a scrollable list of eclipses to choose from.	+	The orrery can display information about every [[:wikipedia:Lunar_Eclipse\|lunar eclipse]] occurring from from 1999 BC through 3000 AD - a bit more than 12000 eclipses (the database used is the "Five Millennium Canon of Lunar Eclipses: -1999 to +3000" available at http://eclipse.gsfc.nasa.gov/SEpubs/5MCLE.html, although the orrery generates its own maps). It will display information about the visibility and duration of the eclipse as seen from the current location. When one selects the Lunar Eclipse page, the checklist page shown on the right is presented.[[Image:OrreryLunarEclipsePage1.png\|thumb\|200px\|alt=Selection page for Lunar Eclipses\|Selection page for Lunar Eclipses]] Because so many eclipses can be displayed, by default the user is presented with a small subset of the eclipses: those which occur during the next 10 years. One may change the starting and ending years to access other eclipses. The "List only eclipses visible from here" checkbox allows you to produce a list of only those eclipses for which at least some portion of the eclipse is visible at your location. Other checkboxes allow you to decide which types of lunar eclipses; penumbral, partial and/or total, you wish to display. By default [[:wikipedia:Lunar_Eclipse#Types_of_lunar_eclipse\|penumbral]] eclipses are not displayed, because they involve only a rather subtle changing of the moon's illumination. If you change any of the selection criteria on this page, you need to tell the program to generate a new list of eclipses to display by pressing the "Rebuild the Eclipse List" button. If you don't change the checkboxes, you do not need to push that button. To select the eclipse you wish to observe, click the "Click Here to Select the Eclipse to Display" area, and you will be presented with a scrollable list of eclipses to choose from.


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-	The upper graphic on the eclipse display page shows the path of the moon through the earth's shadow. The penumbra (where the earth only partially blocks the sun as seen from the moon) is shown in light grey and the umbra (where the earth completely blocks the sun as seen from the moon) is shown in darker grey. The ecliptic is shown in red, and the path of the moon is indicated with a turquoise arrow. If the moon rises or sets at your location during the eclipse, the moon's position in the shadow at that time is shown in red.	+	The upper graphic on the eclipse display page shows the path of the moon through the earth's shadow. The [[:wikipedia:Umbra\|penumbra]] (where the earth only partially blocks the sun as seen from the moon) is shown in light grey and the umbra (where the earth completely blocks the sun as seen from the moon) is shown in darker grey. The ecliptic is shown in red, and the path of the moon is indicated with a turquoise arrow. If the moon rises or sets at your location during the eclipse, the moon's position in the shadow at that time is shown in red.

kenyoung: Changed version number, added source of lunar eclispe data

2012-05-27T04:24:35Z

Changed version number, added source of lunar eclispe data

← Older revision		Revision as of 04:24, 27 May 2012
Line 1:		Line 1:
-	The orrery is a simple open-source application for [[Open development/Maemo roadmap/Fremantle\|Maemo 5]] which displays the night (and day!) sky. It is nowhere near as elaborate as, for example, kstars, xephem or stellarium. It is intended to be a small, finger-friendly application, requiring no network connection. The current stable version is 3.6.x (the x just increments when bugs are fixed). The program version is shown on the "Symbol Key" page.	+	The orrery is a simple open-source application for [[Open development/Maemo roadmap/Fremantle\|Maemo 5]] which displays the night (and day!) sky. It is nowhere near as elaborate as, for example, kstars, xephem or stellarium. It is intended to be a small, finger-friendly application, requiring no network connection. The current stable version is 3.7.x (the x just increments when bugs are fixed). The program version is shown on the "Symbol Key" page.

	The source code is hosted on [https://github.com/kenyoung/orrery this github repository]. The version there may not have gone through the Maemo Community QA testing. The most recent version which has been vetted by the community is available in the Maemo [[Extras]] catalog. This wiki page describes the behavior of the version of the program available in the Extras Devel catalog.		The source code is hosted on [https://github.com/kenyoung/orrery this github repository]. The version there may not have gone through the Maemo Community QA testing. The most recent version which has been vetted by the community is available in the Maemo [[Extras]] catalog. This wiki page describes the behavior of the version of the program available in the Extras Devel catalog.
Line 269:		Line 269:
	{{clear}}		{{clear}}
	==== Lunar Eclipses ====		==== Lunar Eclipses ====
-	The orrery can display information about every lunar eclipse occurring from from 1999 BC through 3000 AD - a bit more than 12000 eclipses. It will display information about the visibility and duration of the eclipse as seen from the current location. When one selects the Lunar Eclipse page, the checklist page shown on the right is presented.[[Image:OrreryLunarEclipsePage1.png\|thumb\|200px\|alt=Selection page for Lunar Eclipses\|Selection page for Lunar Eclipses]] Because so many eclipses can be displayed, by default the user is presented with a small subset of the eclipses: those which occur during the next 10 years. One may change the starting and ending years to access other eclipses. The "List only eclipses visible from here" checkbox allows you to produce a list of only those eclipses for which at least some portion of the eclipse is visible at your location. Other checkboxes allow you to decide which types of lunar eclipses; penumbral, partial and/or total, you wish to display. By default penumbral eclipses are not displayed, because they involve only a rather subtle changing of the moon's illumination. If you change any of the selection criteria on this page, you need to tell the program to generate a new list of eclipses to display by pressing the "Rebuild the Eclipse List" button. If you don't change the checkboxes, you do not need to push that button. To select the eclipse you wish to observe, click the "Click Here to Select the Eclipse to Display" area, and you will be presented with a scrollable list of eclipses to choose from.	+	The orrery can display information about every lunar eclipse occurring from from 1999 BC through 3000 AD - a bit more than 12000 eclipses (the database used is the "Five Millennium Canon of Lunar Eclipses: -1999 to +3000" available at http://eclipse.gsfc.nasa.gov/SEpubs/5MCLE.html, although the orrery generates its own maps). It will display information about the visibility and duration of the eclipse as seen from the current location. When one selects the Lunar Eclipse page, the checklist page shown on the right is presented.[[Image:OrreryLunarEclipsePage1.png\|thumb\|200px\|alt=Selection page for Lunar Eclipses\|Selection page for Lunar Eclipses]] Because so many eclipses can be displayed, by default the user is presented with a small subset of the eclipses: those which occur during the next 10 years. One may change the starting and ending years to access other eclipses. The "List only eclipses visible from here" checkbox allows you to produce a list of only those eclipses for which at least some portion of the eclipse is visible at your location. Other checkboxes allow you to decide which types of lunar eclipses; penumbral, partial and/or total, you wish to display. By default penumbral eclipses are not displayed, because they involve only a rather subtle changing of the moon's illumination. If you change any of the selection criteria on this page, you need to tell the program to generate a new list of eclipses to display by pressing the "Rebuild the Eclipse List" button. If you don't change the checkboxes, you do not need to push that button. To select the eclipse you wish to observe, click the "Click Here to Select the Eclipse to Display" area, and you will be presented with a scrollable list of eclipses to choose from.

kenyoung: Added section on Lunar Eclipses

2012-05-27T03:47:33Z

Added section on Lunar Eclipses

← Older revision		Revision as of 03:47, 27 May 2012
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	Showing all of the navigational objects on one page requires a very small font, which is hard to read. If you press the touchscreen near any of the objects, a white box will appear highlighting a selected object. Releasing the screen will present another page showing the data for the selected object only, with a much larger, more readable font, as shown on the right.		Showing all of the navigational objects on one page requires a very small font, which is hard to read. If you press the touchscreen near any of the objects, a white box will appear highlighting a selected object. Releasing the screen will present another page showing the data for the selected object only, with a much larger, more readable font, as shown on the right.

		+	{{clear}}
		+	==== Lunar Eclipses ====
		+	The orrery can display information about every lunar eclipse occurring from from 1999 BC through 3000 AD - a bit more than 12000 eclipses. It will display information about the visibility and duration of the eclipse as seen from the current location. When one selects the Lunar Eclipse page, the checklist page shown on the right is presented.[[Image:OrreryLunarEclipsePage1.png\|thumb\|200px\|alt=Selection page for Lunar Eclipses\|Selection page for Lunar Eclipses]] Because so many eclipses can be displayed, by default the user is presented with a small subset of the eclipses: those which occur during the next 10 years. One may change the starting and ending years to access other eclipses. The "List only eclipses visible from here" checkbox allows you to produce a list of only those eclipses for which at least some portion of the eclipse is visible at your location. Other checkboxes allow you to decide which types of lunar eclipses; penumbral, partial and/or total, you wish to display. By default penumbral eclipses are not displayed, because they involve only a rather subtle changing of the moon's illumination. If you change any of the selection criteria on this page, you need to tell the program to generate a new list of eclipses to display by pressing the "Rebuild the Eclipse List" button. If you don't change the checkboxes, you do not need to push that button. To select the eclipse you wish to observe, click the "Click Here to Select the Eclipse to Display" area, and you will be presented with a scrollable list of eclipses to choose from.
		+
		+
		+	Once you have chosen the eclipse you're interested in, you will be shown information about that eclipse on a new page. Once such image, for the total lunar eclipse of April 15, 2014, is shown on the right.[[Image:OrreryLunarEclipsePage2.png\|thumb\|200px\|alt=Lunar Eclipse Display Page\|Lunar Eclipse Display Page]] Below the title of the page, the orrery displays whether or not you can see the selected eclipse. If the moon rises or sets during the eclipse, that information is listed too. Below that, the duration of each phase of the eclipse (as seen from your location) is listed. Below that, the starting and ending times of each phase, along with the time of maximum eclipse, is listed. All times are in Universal Time. Remember that if you observe the penumbral phase of the eclipse, the changes in the moon's appearance may not even be noticeable; only the partial and total phases are visually striking.
		+
		+
		+	The upper graphic on the eclipse display page shows the path of the moon through the earth's shadow. The penumbra (where the earth only partially blocks the sun as seen from the moon) is shown in light grey and the umbra (where the earth completely blocks the sun as seen from the moon) is shown in darker grey. The ecliptic is shown in red, and the path of the moon is indicated with a turquoise arrow. If the moon rises or sets at your location during the eclipse, the moon's position in the shadow at that time is shown in red.
		+
		+
		+	At the bottom of the eclipse display page a map is presented showing the portions of the earth which can see the eclipse. The observer's location is indicated with a red dot, and the map itself is centered at the longitude of the observer. The light blue dot shows the position on the earth for which the moon is at the zenith at the moment of maximum eclipse. The light blue line shows the longitude for which the moon is on the meridian at the moment of maximum eclipse. The darkest grey region shows the portion of the earth for which none of the eclipse can be seen. Observers in the white region can see at least some portion of the maximum phase of the eclipse. In other words, if the eclipse is total, an observer in the white region sees at least some part of the total phase of the eclipse. If the eclipse is partial, an observer in the white region sees a partial eclipse. Other shades of grey are used for regions that, for example, can only see the partial phases of a total eclipse. The next image to the right indicates the meaning of the various shaded regions and lines on this eclipse visibility plot.[[Image:OrreryLunarEclipseMapKey.png\|thumb\|200px\|alt=Lunar Eclipse Visibility Plot\|Lunar Eclipse Visibility Plot]]
	{{clear}}		{{clear}}

kenyoung: /* Chinese Color Scheme */ - Fixed typo

2012-04-25T13:06:42Z

Chinese Color Scheme: - Fixed typo

← Older revision		Revision as of 13:06, 25 April 2012
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	== Chinese Color Scheme ==		== Chinese Color Scheme ==

-	In traditional Chinese astronomy, the zodiac is known as the Yellow Way, and the celestial equator is known as the Red Way. If you want the orrery to use that color scheme for great circles and constellations, edit the file <code>/usr/share/orrery/config</code>, and make the first ~~lineread~~	+	In traditional Chinese astronomy, the zodiac is known as the Yellow Way, and the celestial equator is known as the Red Way. If you want the orrery to use that color scheme for great circles and constellations, edit the file <code>/usr/share/orrery/config</code>, and make the first line read

	CHINESE_COLOR_SCHEME 1		CHINESE_COLOR_SCHEME 1