Calculating Moon Azimuth

Hello,

If I have a point on earth with with specific Lat and Long. And if I
have the Lat and Long of the moon for specific time. How can I get the
Azimuth between the point on earth and the moon? I'm trying to draw the
earth in circle and show the moon location with respect to the point on
earth for a specific time. Is the Azimuth what i really need?

N
|
|
W ------- E
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| O moon
S



I'm not expert on this subject but I have program that gives me the
current lat and long of the moon at specific time but I do not know how
to convert this location to degrees where i can plot it with respect to
the observer lat and long. Any formulas or examples is greatly
appreciated.


Thanks for your help

Hello,

The moon's latitude equivalent is its declination. Its hour angle is its
longitude's equivalent.

taken from http://aa.usno.navy.mil/

The azimuth is found from the formula:

tan A = sin(LHA)cos(?)/[sin(?)cos(LHA)cos(?)-sin(?)cos(?)]

where A is the azimuth angle. When finding the azimuth, the double-argument
arctangent function (such as ATAN2 in Fortran) should be used with the
numerator and denominator above entered seperately. This will give a
resulting angle between ± 180 degrees. Since the range of azimuth values are
between 0 and 360 degrees, 360 degrees will have to be added to the
double-argument result to give the proper azimuth when the azimuth angle is
negative.

HTH
Jacquelin Hardy

1146424412.190684.173300@y43g2000cwc.googlegroups.com...