| 释义 |
Sidereal clock
| an astronomical clock regulated to keep sidereal time. | | See under Clock, Day, etc. |
See also: Clock, Sidereal sidereal clock
sidereal clock A clock regulated to measure the sidereal time at an observatory. See also transit circle.sidereal clock[sī′dir·ē·əl ′kläk] (horology) A clock set at 0 hours 0 minutes 0 seconds (midnight) as the vernal equinox crosses the meridian; it is the astronomical clock. ThesaurusSeesidereal time |