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- | 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. | + | 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. | ||
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==== 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. | + | 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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- | 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 | + | 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]] |
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=== Displayed Items === | === Displayed Items === |
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