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sidereal day |
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sidereal day: see sidereal time sidereal time (ST), time measured relative to the fixed stars; thus, the sidereal day is the period during which the earth completes one rotation on its axis so that some chosen star appears twice on the observer's celestial meridian . ..... Click the link for more information. . sidereal day [sī′dir·ē·əl ′dā] (astronomy) The time between two successive upper transits of the vernal equinox; this period measures one sidereal day. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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