| 单词 | sidereal hour |
| 释义 | > as lemmassidereal hour Formerly the hours were commonly reckoned as each equal to one-twelfth of the natural day or night, whatever its length (called planetary, temporary, or unequal hours); the equal hours were sometimes distinguished as equinoctial, being each equal to a temporary hour at the equinoxes. sidereal hour, solar hour, 24th part of a sidereal, or solar, day.extracted from hourn.< as lemmas |
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