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- Q3380435 subject Q7238070.
- Q3380435 abstract "In astronomy, the hour circle of a celestial object is the great circle through the object and the celestial poles. It is perpendicular to the celestial equator. The declination of an object as observed on the celestial sphere is the angle measured along the hour circle of that object to the celestial equator. In other words, it is analogous to meridians or longitudes on a globe. A meridian on the celestial sphere matches an hour circle at any time. So called because the angle between the planes of the hour circles (or the difference in longitudes) of two objects is sometimes measured in hours (or hours, minutes, and seconds), one revolution (360°) being equivalent to 24 hours, or 1 hour being equivalent to 15°.".
- Q3380435 thumbnail Hour_circle.svg?width=300.
- Q3380435 wikiPageExternalLink hour-circle.
- Q3380435 wikiPageWikiLink Q12119.
- Q3380435 wikiPageWikiLink Q146657.
- Q3380435 wikiPageWikiLink Q148901.
- Q3380435 wikiPageWikiLink Q187646.
- Q3380435 wikiPageWikiLink Q333.
- Q3380435 wikiPageWikiLink Q7238070.
- Q3380435 wikiPageWikiLink Q76287.
- Q3380435 comment "In astronomy, the hour circle of a celestial object is the great circle through the object and the celestial poles. It is perpendicular to the celestial equator. The declination of an object as observed on the celestial sphere is the angle measured along the hour circle of that object to the celestial equator. In other words, it is analogous to meridians or longitudes on a globe. A meridian on the celestial sphere matches an hour circle at any time.".
- Q3380435 label "Hour circle".
- Q3380435 depiction Hour_circle.svg.