中文翻译与英英解释 | 【天文学】太阳年，回归年。
| | | tropical: adj. 1.热带(地区)的，回归线下的。 2.非常热的 ... | | year: n. 1.年，岁；一年。 2.年度，学年。 3.〔pl. ... | |
| the time for the earth to make one revolution around the sun, measured between two vernal equinoxes
同义词：solar year, astronomical year, equinoctial year,
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| A tropical year (also known as a solar year), for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice. Because of the precession of the equinoxes, the seasonal cycle does not remain exactly synchronized with the position of the Earth in its orbit around the Sun. |
例句与用法 | 1. | During a tropical year the sun moves from vernal equinox to vernal equinox .
在一个回归年内，太阳从春分点转回到春分点。
| | 2. | The tropical year is the interval between two transits of the mean sun through the mean equinox .
回归年是平太阳两次通过平春分点的时间间隔。
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