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Reducing Stars, Planets, and the Moon Using Pub 229
Procedure for
Stars and
Planets
The steps to follow to reduce stars and planets are nearly the same steps
that we used to reduce our sunline. The only differences are that in both
cases when finding LHA, we must add the value of sidereal hour angle
(SHA) to the total GHA to find LHA. Also, in the altitude correction
tables for stars and planets there is an additional correction listed for
some planets that must be added.
Procedure for
the Moon
Once again the steps for the Moon are the same as our sunline except
that the v and HP corrections must be added. These are additional
altitude corrections. The v correction is always +. The HP correction
for the nearest whole hour of GMT is selected. The v correction is
found on the appropriate increments minutes and seconds page in the
same manner as the d correction. If the upper limb of the Moon is
observed, an additional correction (Add’l Corr) of -30' is made.
9-3 1
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