A、The motion of the apparent sun is along the ecliptic
B、Measurement of time is along the celestial equator
C、The speed of the Earth's revolution is not constant
D、There are variations in the Earth's rotational speed
更多“A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）”相关的问题
A、A.equal to the longitude expressed in time units B、B.about 16 minutes C、C.the difference between the GHA of mean sun and the first point of Aries D、D.15°of arc
A、the Sun，Earth，and Moon are at right angles B、the Sun's declination is 0°and is moving south C、an inferior planet is at the maximum angle to the line of sight to the Sun D、the Earth is between a planet and the Sun
A、net share su=d:\sun /unlimit B、net use su=d：\sun /unlimit C、net user su=d：\sun /unlimit D、net share su= \sun /unlimit
A、is most accurate before sunrise B、is most accurate after sunset C、should only be observed when the Sun's lower limb is above the horizon D、is most accurate when the Sun's center is observed on the visible horizon
A、coolant for the distillate B、coolant for the brine cooler C、means of heating the feedwater D、primary means of producing a vacuum within the distiller
A、The meaning of Flag G is “I have a pilot on board”. B、The meaning of Flag G is “I require a pilot”. C、The meaning of Flag G is “I require assistance.” D、The meaning of Flag G is “I require PSC on board”.
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