Astronomy: Fundamentals and Frontiers by Robert Jastrow

By Robert Jastrow

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First released 1995
ebook ISBN13: 9780802779434

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Extra resources for Astronomy: Fundamentals and Frontiers

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25 The daily shift in the apparent position of the sun at noon, as the earth moves in its orbit. west of the position it had on the previous night, because the earth has one degree past a complete turn. m. m. on the night after that. If you adjusted your watch to run four minutes fast each day, each star would appear in the same position after an apparent lapse of 24 hours. The watch would then be keeping sidereal time. A sidereal watch — running four minutes fast each day— would be a great convenience to a person who observed the stars a great deal, because all the stars would return to their identical positions in the sky every 24 hours.

Bulges out as a result of this effect. The side of the earth facing The bulge toward the moon called the lunar tide. The height of the lunar tide is greatest when a large body of water, such as one of the major oceans, faces in the direction of the moon, since water can flow freely in response to the extra force. Tides in the open ocean or sea are approximately two feet high. If the ocean or sea tide is channeled into a narrow opening, for example the mouth of a river, the height of the tide can be much greater than two feet.

They form a single group moving through space with five of the approximately the same velocity and direction. The first star of the seven, marking the end of the handle, and the last star, marking the end of the bowl, are completely unrelated to the other five and to one another. The marking the end of the handle is 109 light-years from us and moving star in a direction opposite to that of the middle five, while the star marking the end of the bowl is 250 tion opposite to that of the light-years middle away and also moving in a direc- five stars.

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