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CHAP. XVIII.
The right ascention of the Sun or Starre being given, together with the difference of their ascentions, to finde the oblique ascention.
THe right ascention of any point of the Heavens being knowne, the dif∣ference of the ascention is either to be added thereunto or else to be sub∣stracted from it, according as the Starre is situate in the Northerne or Southerne Signes: As for example, if the Sun be in a∣ny of these six Signes, Aries, Taurus, Gemini, Can∣cer, Leo, or Virgo, then the difference of the ascenti∣ons is to be substracted from the right ascention, and the remainder is the oblique ascention. Suppose there∣fore the Sunne to be in the fourth degree of Gemini, where the right ascention is found to be foure houres, and 8 minutes, or 62 degrees, and the difference of ascention where the Pole is elevated 51 degrees, is found to be one houre 53 minutes otherwise 28 de∣grees 53 minutes, which being taken from the right ascention, leaves two houres, and 16 minutes, or 33 degrees, and 42 minutes, which is the oblique ascen∣tion of the Sun in the fourth degree of Gemini. But if the Sun be upon the South side of the Equinoctiall, either in Libra, Scorpio, Sagitarius, Capricornus, A∣quarius, or Pisces, then the difference of the ascenti∣ons is to be added unto the right ascention, and the Product will be the oblique ascention. Suppose the fourth degree of Sagitarius, is given, for which signe and degree the oblique ascention of the Sun is desi∣red,