Note 289 — NO. II ALMAGEST; BOOK II. EXTRACT FROM CHAP. IX

Let the first point of Gemini be on the meridian above the earth; the number of temporal hours since sunrise will then be 6, by which 17° 6′ 30″ are to multiplied. The product will be 102° 39′: this, added to 45° 5′, the aggregate number of the first point of Gemini in the latitude of Alexandria, will give 147° 44′, which, in the ascensions of the climate in question, will correspond to the 3d degree of Virgo, and show that to be the degree ascending. In the latitude of Southern Britain the total number would still amount to the same, viz. 147° 44′, but it would show 7° and about 30′ of Virgo to be ascending.