Topic: How to find GHA Aries
posted November 29, 2002 02:10 PM
There is no direct menu item for GHA Aries, but we can find it indirectly.
GHA * = GHA Aries + SHA *, so
GHA Aries = GHA * - SHA *.
Precompute (    ) any star to get GHA Star and SHA Star, then subtract them to get SHA. If negative, add 360º.
Lat and Lon does not matter. Use Markab (#57) with lowest SHA to minimize need for the extra correction.
Example: Nov 9, 2002 find GHA Aries at 12h 12m 12s UTC.
Lat? 00 (Can leave whatever shows up here)
Lon?00 (Can leave whatever shows up here)
-13º30.8' (This star was below the horizon)
Then figure GHA Aries = 245º 19.5' - 013º 46.6' = 231º 32.9'