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Reposting the corrected Meridian Angle algorithm. The one in my previous post (Worksheet) only worked with same hemisphere (Lat and Dec) sights. Had to redo the math to find the error. 

Matt

Meridian Angle Algorithm

Same           Contrary

A: Dec           A: Dec

B: Lat           B: Lat

C: H.O.           C: H.O.

D: 90-A           D: 90+A

E: 90-B           E: 90-B

F: 90-C           F: 90-C

G: D+E           G: D-E

H: D-E           H: D+E

I: Hav F           I: Hav F

J: Hav G           J: Hav G

K: Hav H.          K: Hav H

L: I-K           L: I-J

M: J-K           M: K-J

N: Log L           N: Log L

O: Log M   O: Log M

P: N-O           P: N-O

Q: Angle of P   Q: Angle of P