From which does information come on planets in Celestia ?

[Dani3L]

Good Morning

Sorry for my english but I'm french.

I have seen that all the data about planets are in Celestia in the file : solarsys.ssc

I would like to know from which this information comes. From web sites ? Books ?

For example, if I want to make a software of astronomy like Celestia, where I can find this kind of information on the stars and planets.

Thank you.

[selden]

Planetary orientations are taken from
Explanatory Supplement to the Astronomical Almanac

Planetary orbits are calculated using VSOP87

[ElChristou]

Salut,

Instead of creating a brand new soft, why don't you enter the Celestia dev team?

[selden]

For those unwilling to pay for a hardcopy, an electronic preprint of the IAU article with just the planetary information is available at http://astrogeology.usgs.gov/Projects/ISPRS/PREPRINTS/index_preprints.html

[Dani3L]

Thank you for your answers.

To answer ElChristou I think that I don't have yet the level in programming for the project Celestia. I had to create for my work of diploma a software of simulation of the solar system and I would like to develop it a little more.

Which is the necessary level in C++ language to be able to develop Celestia ?

[Apollonian]

This may help as well:

Web Ephemerides etcetera
http://aa.usno.navy.mil/data/docs/WebMICA_2.html

http://aa.usno.navy.mil/