A Treatise On Astronomy Theoretical And Practical volume 12
A Treatise On Astronomy Theoretical And Practical volume 12
Robert Woodhouse
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The disproportion, therefore, be- tween these two gravities is lessened ; the ratio between them is less than that of the inverse square of the distance. The Moon, therefore, if moving towards perigee, meets the line of the apsides, in a point more remote from the Earth than the mean place of the perigee : if moving towards the apogee, in a point between the Earth and the mean place of the apogee. The orbit, by these means, becomes less eccentric ; the Equation of the centre is diminished, and,... the diminution is the Ejection. We will now proceed to consider the third inequality called The Variation. (See Physical Astronomy, pp. 217, Sec. ) By comparing the Moon's place computed, from her mean motion, the equation of the centre, and the Evection, with her observed place, Tycho Brahe, in the sixteenth century, discovered that the two places did not always agree. They agreed only in opposition and conjunction, and varied most, when the Moon was half way between quadratures and syzygies, that is, in Octants.
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