The angular distance of a point east of the First Point of Aries, measured along the ecliptic. Compare with right ascension.
- But in fact, from day to day the earthbound observer does see the midday Sun at a different point along the same celestial longitude - up or down relative to the horizon.
- By the time he returned home in January 1678, he had recorded the celestial longitudes and latitudes of 341 stars and observed a transit of Mercury across the Sun's disk.
- Technically, a conjunction describes a precise alignment of heavenly bodies that happen to have the same celestial longitude - that is, they appear to line up in the sky, one directly above the other.
Definition of celestial longitude in:
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