Comments (2)
Given RA & Dec, time, and latitude/longitude, the calculation is pretty
straightforward. Essentially, you want to calculate altitude and azimuth. I
found this site that has the formulae:
http://www.stargazing.net/kepler/altaz.html
Then, and object is above the horizon if altitude > 0.
In the Sky Map code, you can get the RA & Dec using the RaDec class
(trunk/app/src/com/google/android/stardroid/units/RaDec.java). We don't
explicitly calculate Alt/Az, which is why you have to do the calculation by
hand.
Let me know if that makes sense.
Original comment by [email protected]
on 6 Feb 2012 at 1:51
from stardroid.
It does make a lot of sense :) Thanks so much.
I have already found some javascript code that calculates the sun's horizontal
altitude directly and i successfully ported it to Java.
See the result here:
https://market.android.com/details?id=de.goddchen.android.solarcollector :)
Original comment by [email protected]
on 6 Feb 2012 at 7:35
from stardroid.
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