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By Robert Jastrow

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Extra resources for Astronomy - Fundamentals and Frontiers

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However, twice each month the sun and moon is new and the moon and sun are on the same and when the moon is full and the sun and moon are Sun's pull P 1 pull i moon Sun Earth tides also sides. Full The is less together to produce exceptionally large tides. These are the side of the earth on opposite than the moon, result, the tide-raising force of produced on these occasions, called spring tides, are 20 per- cent higher than the average tides. On two other occasions in each month, the sun and moon are at right when the moon angles with respect to the earth.

Which in celestial latitude is given in but celestial longitude equator, tial degrees north or south of the celesis given hours, minutes, and in seconds of sidereal time, calculated from the celestial longitude in degrees by applying a ratio based on the equivalence of 360 degrees 24 sidereal hours. ). The Right Ascension runs eastward around the celestial equator from zero hours at the zero-point on the equator to 24 hours at the same point after completion of a full circle. to units 90 degrees a star lies If Ascension is 6 hours.

Annular eclipses occur with a slightly higher average frequency than total eclipses. Figure 15 shows an annular eclipse, with an uneven pattern of illumination around the edges of the moon's disk, caused by rays of sunlight streaming through greatest distance from the earth, the 1. the lunar valleys. The Partial Eclipse. to the ^^^^^ A partial eclipse sun-earth line, but not close sun's rays from any region lie on the occurs enough earth. On when to moon is close the regions of the earth that within the path of the partial eclipse, the moon's disk will bite into the sun but will never cover it entirely.

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