Only after a full year does it return to the same position, having traced out a path through the stars known as the ecliptic. Yet it is vitally important for anyone investigating possible architectural alignments upon the sun, moon, or planets to take account of the way the obliquity of the ecliptic changes over the centuries, just as it is necessary for investigations of possible stellar alignments to take account of precession.Įach day, as the stars and sun move together around the rotating celestial sphere, the sun moves by a small amount against the stars. Obliquity of the ecliptic is not a term that trips easily off the tongue, nor is it an easy concept to grasp technically.
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