sidereal
英 [saɪ'dɪərɪəl]
美 [saɪ'dɪrɪəl]
- adj.[天体]恒星; 惑星の軌道から決定される.
語源
sidereal サイドリアル。フランス語のsidereal、恒星から、ラテン語のsideris、星、sidus、星、星のすべての形、consider、欲望から。
英語の語源
- sidereal (adj.)
- 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.
例文
- 1. The sidereal year is not used to construct a calendar.
- 恒星年はカレンダーを作成するために使用されません。
- 2.A sidereal day is about 4 minutes shorter than a solar day.
- 1つの恒星の日は1つの太陽の日より約4分短い。
- 3.A sidereal day is shorter than a mean solar day by 3 minutes and 56 seconds.
- 恒星の日は平均太陽の日より3分56秒短い.
- 4.Tropical year，and sidereal year are two different concepts.
- 回帰年と恒星年は異なる2つの概念である。
- 5.A solar day is four minutes longers than a sidereal day.
- 太陽の日は恒星の日より4分長い。
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