单词 | local sidereal noon |
释义 | local sidereal noon [`lō·kǝl sǝ¦dir·ē·ǝl ¦nün] ASTRONOMY Zero hour local sidereal time, or the instant the vernal equinox is over the upper branch of the local meridian; local sidereal noon at the Greenwich meridian is called Greenwich sidereal noon. |
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