Author
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Topic: How to find GHA Aries
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vjwilliams
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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 ( [2] [4] [2] ) 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.
WT? 12.1212 Day?9 Month?11 Year?2002 Star,0=List?57 Lat? 00 (Can leave whatever shows up here) Lon?00 (Can leave whatever shows up here)
57:MARKAB 2.6 Hc/Zn/GHA/DEC/SHA -13º30.8' (This star was below the horizon) 302.0º 245º 19.5' 015º 13.3' 013º 46.6'
Then figure GHA Aries = 245º 19.5' - 013º 46.6' = 231º 32.9'
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