Total rewrite

[ghost]

This is a complete rewrite of the astro library in order to support the planets and stars (in addition to the luminaries, that were already supported). In so doing, it seemed like a reasonable time to rewrite the entire interface.

This is not yet complete:

• Tests need to be written to verify the accuracy and correctness of everything!
  • sun
  • moon
  • planets
  • fixed stars
• The moon's position is (theoretically) inaccurate, since it's close enough that your position on the surface of the earth matters. We need to apply a correction factor when you go into horizontal coordinates.
• The moon should include phase, illuminated fraction, etc.
• Rise/set/transit times should be supported.
• I just picked a few bright and culturally/historically important stars. Should we add other things, too?
• There's a lot of room for optimization. (One thing I'm particularly curious of: I'm using defineGetter to set cached objects on the local object. This is elegant and convenient, but is a different method more efficient?)

[ghost]

I tested defineProperty and it's quite slow. I'll switch to other ways of doing it.

[YOEL311]

when will it be ready
Can I help with something?

[ghost]

It'll be ready when it's ready :)

It's just waiting on time to finish up the rise/transit/set portions. The math isn't hard, I've just been really busy for the last two weeks, and expect to be really busy for the next few.

[ghost]

I rewrote all of this again, for more accuracy and to support sunrise and set. Will open a new PR.