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This is the inverse of Section 6.3, “hourAngleToRA(): Convert an hour
angle to right ascension”:
given a right ascension ra and the
observer's time and location, it returns the hour angle
in radians.
raToHourAngle(ra, ut, eLong)
ra
The right ascension in radians.
ut
The Universal Time as a datetime
instance.
eLong
The east longitude in radians.