CHAP. 9. Of the Theory and Motion of the Moon.
THe Moon according to our Hypothesis is a secondary planet, mo∣ving about the earth, as the earth and other planets doe about the Sun, and so not onely the earth, but the whole Systeme of the Moone is also carryed about the Sun in a yeare, And hence according to Hypparchus there ariseth a twofold, but according to Tycho a threefold inequality in the Moons motion. The first is periodicall, and is to be obtained, after the same manner, as was the excentrique Equation of the Sun or Earth; in order whereunto her middle motions should be first stated, the which Bullialdus by the rules delivered in the fourth and fifth Chapters preceding hath for the Meridian of Uraniburge determined to be as followeth.
From the Equinoctiall to the beginning of the Christian Aera, the
Moons middle motion was | 135d. | 16′ | 27″ |
The Meane Anomalie | 355 | 5 | 18 |
And the Radix of her latitude | 366 | 29 | 56 |
These then we will take for granted, until there be a more exact, and true Geometrical way propounded to us,; onely we will convert them into Decimall numbers, and reduce them to the Meridian of London.