VI. To find the Latitude of M AR S at the fame time.. B.fore the Latitude can be found, the Argument of Latitude muft be had: To the attaining whereof, Lay a Ruler to the Centre, and the Point in the Planets Orbit; fo will the Ruler cut the Ecliptick in the Point e: And a Ruler laid from the Centre to , will cut the Ecliptick in the Point d: So that the Angle do e is the Argument of Latitude; and in this our Example will be found (by measuring the Degrees of the Ecliptick Circle between d and e) to be 149.75 deg.. The Argument of Latitude thus attained, the true Latitude may be found by the following Canon. As the Radius, Sine 90 de. 10. Is to the the Sine of the Arg. of Latit. (149.75 d.) 9.7022357 So is the Tang. of Mars Greatest Incl. 1.84 de.. To the Tangent of 0.92 deg. 8.5068445 8.2090802 Which 0.92 Degrees is the Latitude of MARS feen at the But to find the Latitude as feen at the Earth, A Fig. LXXVI.. The Proportion is, As the Diffance 8, 8820 Is to the Diffance, 5550 3.945468 3.744293 So is the Tang. of the Latit. feen at the Sun 0.92 de. 8.205702 To the Tangent of 0.58 deg. Which is the Latitude of Mars feen from the Earth. II.949995: Thee Figure LXXVII. The Equal Motions of the Anomalies of the Earth, and the other Five Planets, h, 4, 8, 9, , For the 18th Day of October, at Noon, Anno 1705. |