also siderial, 1630s, "star-like;" 1640s, "of or pertaining to the stars," earlier sideral (1590s), from French sidereal (16c.), from Latin sidereus "starry, astral, of the constellations," from sidus (genitive sideris) "star, group of stars, constellation," probably from PIE root *sweid- "to shine" (cognates: Lithuanian svidus "shining, bright"). Sidereal time is measured by the apparent diurnal motion of the fixed stars. The sidereal day begins and ends with the passage of the vernal equinox over the meridian and is about four minutes shorter than the solar day, measured by the passage of the sun over the meridian.
双语例句
1. The sidereal year is not used to construct a calendar.
恒星年不用于编制年历.
来自辞典例句
2. A sidereal day is about 4 minutes shorter than a solar day.
一个恒星日比一个太阳日大约短4分钟.
来自辞典例句
3. A sidereal day is shorter than a mean solar day by 3 minutes and 56 seconds.
恒星日比平均太阳日短三分五十六秒.
来自辞典例句
4. Tropical year, and sidereal year are two different concepts.
回归年与恒星年是不同的两个概念.
来自互联网
5. A solar day is four minutes longers than a sidereal day.
