| 单词 | hour circle |
| 释义 | hour circle (once / 319441 pages) n WORD FAMILY hour circle: hour circles USAGE EXAMPLESIt is equal to the angle at the pole between the hour circle through the body and the meridian, but is usually expressed in time. Various, Encyclopaedia Britannica, 11th Edit...(2012) The hour circle of any star is the great circle passing through it and perpendicular to the plane of the equator. Grimm, Florence M., Astronomical Lore in Chaucer(2011) The movable hour circle and driving wheel of the Crossley reflector has two sets of graduations. Keeler, James Edward, Photographs of Nebul? and Clusters...(2011) n a great circle on the celestial sphere that passes through both celestial poles Hyper great circle a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center |
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