# What are the azimuths of the planets' orbits?

I am creating a virtual solar system model and I want it to be as realistic as possible (e.g. orbits are ellipses, not circles, and orbits are oriented correctly, not all coplanar). In order for me to do this, I need to know the eccentricity of the orbit, the perihelion, the semi-major-axis, inclination and azimuth. I have all of this information, except for the azimuth of the orbit, which is the angle from the sun to the aphelion. Are there any reliable sources with this information?

• en.wikipedia.org/wiki/Orbital_elements Nov 18, 2014 at 2:53
• Can you please give a better definition of azimuthal angle in this case? Even better, would be if you would use the right terminology, according to the page linked by the OP above. Nov 18, 2014 at 8:52
• As noted in the wikipedia article, one needs seven parameters to specify an orbit, the epoch time plus a set of six values that represent the orbit at that point in time. The canonical set is $a$, $e$, $i$, $\Omega$, $\omega$, $M_0$, and $t_0$ (semi-major axis, eccentricity, inclination, right ascension of ascending node, argument of perigee, mean anomaly, and epoch time). Vinnie Caprarola, you only list five parameters in your question. Nov 18, 2014 at 9:31
• Are you creating a static model or a dynamic model where the planets actually move over time? If dynamic, you'll want to use SPICE files for uber-accuracy. Are you modeling planetary moons as well?
– user21
Nov 19, 2014 at 13:17