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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 3.6.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 - the only significant difference between this version and the one in Extras is that it has a Jovian Moons page. |
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The star database was extracted from the [[:wikipedia:Hipparcos_catalog|Hipparcos catalog]]. To ease the computational load, the coordinates are not [[:wikipedia:Precession_(astronomy)#Astronomy|precessed]] or [[:wikipedia:Nutation#Of_the_Earth|nutated]] before being displayed. [[:wikipedia:Orbital_elements|Orbital elements]] are used, rather than [[:wikipedia:Ephemerides|ephemerides]], to calculate planet positions. Although this is less accurate, it dramatically reduces the memory footprint. The planet positions are accurate to a few arc minutes, from 3000 BC to 3000 AD. Since the scale on the default display is approximately 8 arc minutes per pixel, these small errors are imperceptible, unless a very large zoom factor is used. | The star database was extracted from the [[:wikipedia:Hipparcos_catalog|Hipparcos catalog]]. To ease the computational load, the coordinates are not [[:wikipedia:Precession_(astronomy)#Astronomy|precessed]] or [[:wikipedia:Nutation#Of_the_Earth|nutated]] before being displayed. [[:wikipedia:Orbital_elements|Orbital elements]] are used, rather than [[:wikipedia:Ephemerides|ephemerides]], to calculate planet positions. Although this is less accurate, it dramatically reduces the memory footprint. The planet positions are accurate to a few arc minutes, from 3000 BC to 3000 AD. Since the scale on the default display is approximately 8 arc minutes per pixel, these small errors are imperceptible, unless a very large zoom factor is used. | ||
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[[Image:orreryMonthlyMoonCalendar_3.2.png|thumb|200px|alt=Screenshot of monthly moon calendar|Monthly Moon Calendar]] | [[Image:orreryMonthlyMoonCalendar_3.2.png|thumb|200px|alt=Screenshot of monthly moon calendar|Monthly Moon Calendar]] | ||
- | The ''This | + | The ''This Mobth's Moons'' page shows the phase of the moon for each day of a particular month. By default, the current month is shown, but one may use the arrow buttons to pan through the months. |
Both moon calendars show "[[:wikipedia:Blue_Moon|Blue Moons]]", which are (according to the most commonly used definition) the second full moon in a calendar month which has two full moons. Both images at right show the Blue Moon which falls on New Year's Eve, 2009. | Both moon calendars show "[[:wikipedia:Blue_Moon|Blue Moons]]", which are (according to the most commonly used definition) the second full moon in a calendar month which has two full moons. Both images at right show the Blue Moon which falls on New Year's Eve, 2009. | ||
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{{clear}} | {{clear}} | ||
- | ==== | + | ==== Sextant Navigation ==== |
- | [[Image:orrerySextantFullList.png|thumb|200px|alt=Screenshot of the | + | [[Image:orrerySextantFullList.png|thumb|200px|alt=Screenshot of the Sextant Navigation Default Page|Sextant Navigation Default Page]] |
- | The | + | The [[wikipedia:Sextant|Sextant]] Navigation page shows the information needed to perform [[wikipedia:Celestial_navigation|celestial navigation]] calculations with a sextant. The default page, shown on the right, shows the information presented by the [[wikipedia:US_Naval_Observatory|US Naval Observatory]] on its online calculator (located at http://aa.usno.navy.mil/data/docs/celnavtable.php). |
The orrery does not use that Naval Observatory calculator; it calculates the values itself (so you do not need an internet connection to use it). The orrery uses the same list of objects as the Naval Observatory calculator, but it color-codes them differently for improved visibility. Solar System objects are shown at the top of the list in red. Objects with elevations between 15 and 65 degrees are shown in green, and objects above the horizon but outside of that range are shown in grey. Data for Polaris and the First Point in Aries are shown at the bottom of the table, in white. The values are not updated as time passes unless you press the "Press Here to Update" button at the bottom of the page. | The orrery does not use that Naval Observatory calculator; it calculates the values itself (so you do not need an internet connection to use it). The orrery uses the same list of objects as the Naval Observatory calculator, but it color-codes them differently for improved visibility. Solar System objects are shown at the top of the list in red. Objects with elevations between 15 and 65 degrees are shown in green, and objects above the horizon but outside of that range are shown in grey. Data for Polaris and the First Point in Aries are shown at the bottom of the table, in white. The values are not updated as time passes unless you press the "Press Here to Update" button at the bottom of the page. | ||
If you need the reduction table values for some arbitrary time, you can of course use the normal method of changing the orrery's time, and then return to the Sextant Navigation page to see the appropriate values. | If you need the reduction table values for some arbitrary time, you can of course use the normal method of changing the orrery's time, and then return to the Sextant Navigation page to see the appropriate values. | ||
- | [[Image:orrerySextantSingleObject.png|thumb|200px|alt=Screenshot of the | + | [[Image:orrerySextantSingleObject.png|thumb|200px|alt=Screenshot of the Sextant Navigation Single Object Page|Sextant Navigation Single Object Page]] |
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. | ||
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=== Displayed Items === | === Displayed Items === | ||
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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 | + | 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 |
CHINESE_COLOR_SCHEME 1 | CHINESE_COLOR_SCHEME 1 |
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