Note 280 — Chapter X · THE PERIODICAL DIVISIONS OF TIME
J. M. Ashmand translation
Whalley says here, “let a sign be added for each month to the sign of the year. So, in the example before proposed, the last 15° of Gemini, and the first 15° of Cancer, shall serve for the first month: the last 15° of Cancer and the first 15° of Leo, for the second month; and so on. And for days, from 15° of Gemini to 15° of Cancer, rules two days and eight hours after birth, &c.”
Placidus is of opinion, “that Ptolemy, speaking of annual places, is to be understood of the places of secondary directions; and that when he speaks of the menstrual, he hints at the places of progressions.” (Cooper’s Translation, pp. 25 and 57.)