unit 9a - The eclipse season comes each year since the...

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The eclipse season comes ______ each year since the nodes of the Moon's orbit precesses. A. Earlier Astronomical time is defined as ___. A. The hour angle of the object Atomic time is based upon the wavelengths emitted by the Cesium-133 atom. A. correct The Earth's rotation is constant enough to use it as a time reference for all applications of defining time. B. Wrong -- enough irregularities that we now define time using atomic clocks Ephemeris time is _____. A. A time based upon the motions of all the planets The time system based upon the motion of all the planets is called _______ time. C. Ephemeris The hour angle of the vernal equinox is called _____ time. D. Sidereal The mean Sun is a point in the sky which moves uniformly to the West along the celestial equator with the same average rate as the Sun. B. Wrong - it moves to the east Universal time is _____. C. Local mean solar time at Greenwich, England Local mean solar time at Greenwich, England is called _____ time.
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