circle of longitude


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Related to circle of longitude: Circle of latitude, Tropic of Cancer

circle of longitude

Any great circle that passes through the poles of the ecliptic and is thus at right angles to the plane of the ecliptic. Circles of latitude lie parallel to the ecliptic plane.

circle of longitude

[′sər·kəl əv ′län·jə‚tüd]
(astronomy)
A circle of the celestial sphere, parallel to the ecliptic.
(geodesy)

circle of longitude

circle of longitude
circle of longitude
i. A circle of the celestial sphere parallel to the ecliptic.
ii. A circle on the surface of the earth parallel to the plane of the equator. A parallel, along which longitude is measured. Also called parallel of latitude.