A primary astronomy .. . his breadth also varies from 5,232 to 6,365 miles.] 568. How long, then, may an Eclipse of tlie Moon last 1If central, it may last four Twurs. 569. What is the natural progress of a Lunar Eclipse ? As the Moon enters the Earths Penumbra, she losesa portion of the Suns light, and begins to grow pale ordusky, till at length she enters the Umbra, and isreally eclipsed. 5YO. Can an Eclipse of the Moon ever be Annular ? 11 122 PEIMAEY ASTKONOMY. It cannot. 571. Why not? Because the diameter of the Earths shadow, wherethe Moon passes it, is always greater than the diameterof
A primary astronomy .. . his breadth also varies from 5,232 to 6,365 miles.] 568. How long, then, may an Eclipse of tlie Moon last 1If central, it may last four Twurs. 569. What is the natural progress of a Lunar Eclipse ? As the Moon enters the Earths Penumbra, she losesa portion of the Suns light, and begins to grow pale ordusky, till at length she enters the Umbra, and isreally eclipsed. 5YO. Can an Eclipse of the Moon ever be Annular ? 11 122 PEIMAEY ASTKONOMY. It cannot. 571. Why not? Because the diameter of the Earths shadow, wherethe Moon passes it, is always greater than the diameterof the Moon. 572. What is the greatest and least number of Eclipses that canever occur in one year ? There can never be less than two, nor more than seven. 573. What is the most common number?Four. 574. How do astronomers record the extent of Solar and LunarEclipses ? By dividing the diameters of the Sun and Moon intotwelve equal parts, called Digits, and observing howmany of these parts are eclipsed. FIVE DIGITS TWELVE DIGITS. A\\ri||i>.,
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectastronomy, bookyear18
