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Position angle of axis |
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Calculates the position angle of the moon rotational axis
function MoonPositionAngleAxis(date:TDateTime): extended;
Description The position angle of the rotation axis is measured to the north direction, and because the moon equator has only an inclination of about 1° to the ecliptic this value changes between about ±23.5°. The effects of the libration are included in this calculation.
Reference This function is based upon chapter 53 (51) of "Astronomical Algorithms". |