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from the well known
senH = senD*senL + cosD*cosL*cosT
at sunrise and/or sunset (with no semi-diam... ,
refrac...etc...)
H = 0 --> senH = 0
0 = senD*senL + cosD*cosL*cosT
- senD*senL = cosD*cosL*cosT
- (senD*senL)/(cosD*cosL) =
cosT
- (senD/cosD)*(senL/cosL) =
cosT
- tgD*tgL = cosT
jorge
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