mean solar time
mean solar time
mean′ so′lar time`
n.
| Noun | 1. |  mean solar time - (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator) |
| 单词 | mean solar time | |||
| 释义 | mean solar timemean solar timemean′ so′lar time`n.
mean solar timemean solar time:see solar timesolar time,time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial. ..... Click the link for more information. . mean solar timeTime measured with reference to the uniform motion of the mean Sun. The mean solar day is the interval of 24 hours between two successive passages of the mean Sun across the meridian. The mean solar second is 1/86 400 of the mean solar day. The difference between mean solar time and apparent solar time on any particular day is the equation of time. Since the mean Sun is an abstract and hence unobservable point, mean solar time is defined in terms of sidereal time. One mean solar day is equal to 24h 3m 56.555s of mean sidereal time.Mean solar time was originally devised in order to provide a uniform measure of time based on the Earth's rate of rotation, which was assumed, incorrectly, to be constant. The Sun's mean daily motion does however conform closely to universal time. Mean Solar Time(or mean time), a system of time measurement based on the diurnal motion of the fictitious mean sun, whose instant of lower transit is called mean midnight. Mean solar time is counted from mean midnight and is numerically equal to the hour angle of the mean sun plus 12 hours. mean solar time[′mēn ′sō·lər ′tīm]mean time, mean solar timeSee MEF Weather Support Team mean solar time
Synonyms for mean solar time
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