Editing Orrery

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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.
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===== Adding Additional Comets =====
 
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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:
 
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The first line must contain the name of the comet, optionally followed by a second "nickname" for the comet.
 
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All other lines must be formatted as follows:
 
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Character Range                        Description
 
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  0 ->  3                          Year (2012, etc)
 
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  5 ->  7                          Month (Jan, Feb, etc)
 
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  9 -> 10                          Day of month
 
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12 -> 13                          Hour
 
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15 -> 16                          Minute
 
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18 -> 28                          Geocentric RA (HH:MM:SS.SS)
 
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30 -> 40                          Geocentric Dec (+DD:MM:SS.SS)
 
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43 -> 47                          Magnitude (MM.MM)
 
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49 -> 56                          Ecliptic Longitude (DDD.DDDD)
 
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58 -> 65                          Ecliptic Latitude (+DD.DDDD)
 
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67 -> 79                          Distance from Sun (AU)
 
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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 ===

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