A primary astronomy .. . is concave on the west, instead of the east, 9* 102 PRIMARY ASTRONOMY. like the New Moon; and why she is seen before sunrise instead of just after these points will be called up and more fully illustrated 465. What is meant by the Change of the Moon ? It is when she is in conjunction with the Sun,and chcmges from what is called an Old Moon to aNew Moon. [If the student will be on the look-out, he can easily find the Moon west of the Sunin the day-time; and by observing her carefully, will see that she is rapidly approach-ing him. In a short time
A primary astronomy .. . is concave on the west, instead of the east, 9* 102 PRIMARY ASTRONOMY. like the New Moon; and why she is seen before sunrise instead of just after these points will be called up and more fully illustrated 465. What is meant by the Change of the Moon ? It is when she is in conjunction with the Sun,and chcmges from what is called an Old Moon to aNew Moon. [If the student will be on the look-out, he can easily find the Moon west of the Sunin the day-time; and by observing her carefully, will see that she is rapidly approach-ing him. In a short time she will be lost in his beams, and soon after will appeareast of the Sun, just after sundown, as a New Moon. This change, as it is called,takes place when she passes the Sun eastward.] 466. What is meant by the New Moon 1 It is when she appears in the west like a slendercrescent, and during the first seven days after herchange. [1. It is New Moon from A to C in the preceding cut. NEW MOON IN THE WEST JUST AFTER 2. Here is a picture of what you have often seen—the New Moon in the west justafter sundown. The Sun is scarcely out of sight, and the Moon is very close to also will set very soon, and be out of sight. A gentleman is pointing her out totwo boys and a little girl. They are probably some of his students going to theschool-house near by, to a spelling-school, or to hear a Lecture on 467. What are the Cusps of the Moon ?The extremities of the crescent. 468. What are the Moons Syzyges ? Two points in her orbit 180° apart, where she is ]Newand Full Moon. (See A and E in the cut, page 101.) PEIMARY ASTRONOMY. 103 469. What are her Quadratures? Four points in her orbit, 90° apart. (See positions 1,2, 3, and 4, page 101.) 470. What are her Octants ? Eight points, 45° apart. (See A, B, C, D, page 101.) 471. What is the First Quarter 1 It is when the Moon has performed one-quarter ofher journey eastward around the Earth, and appearsjust one-half
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectastronomy, bookyear18
