[quote=Capt. Lee;25941]Latitude. Round it to the nearest whole number.

Find your Declination

Find your t angle = GHA

+m & s

W-/E+ +/- longitude

This will give you your LHA. If it is more that 180 the subtract 360 and your t angle is east. If this number is less than 180 the LHA is t angle and it is W. If you subtract upside down the t-angle is east. ALways make sure to go to the nearest Observed Longitude to make LHA a whole number.

Sto1 Lat

Sto2 Dec

Sto 3 t-angle

Subtract if lat and declination are contrary add if Lat and dec or the same

rcl1 cos x rcl2 cos x rcl3 cos +/- rcl 1 sin x rcl 2 sin = 2nd sin = HC

Sto1 LAt

sto2 DEC (make this negative if lat and dec are contrary)

sto3 HC

rcl2sin -(rcl1 sin x rcl3 sin) = divide rcl1cos divide rcl3 cos = 2nd cos = Z

If take lat north or south and t angle east or west

NE Z=ZN

SE 180-Z=ZN

SW 180+z = ZN

NW 360 - Z = ZN[/quote]

The easiest way I can remember if ātā is E or W is that if it is a morning shot ātā is east and an evening shot ātā is west (the sun rises in the east and sets in the west)