And if it be required to reduce the temporal hours of any given day or night, in a certain climate, into equatorial hours, they must be multiplied by their proper horary times, whether diurnal or nocturnal, as the case may be; the product is then to be divided by fifteen, and the quotient will necessarily be the number of equatorial hours in the climate in question, on the given day or night.[288] On the other hand, equatorial hours are also to be reduced into temporal hours by being multiplied by fifteen, the product of which is to be divided by the horary times proper to the given day or night in the said climate. [288] For example, Diurnal horary times of the first point of Gemini in the latitude of Alexandria 17° 6′ 30″ Number of temporal hours 12 -------------- 15)205 18 0 -------------- Diurnal equatorial hours of the first point of Gemini in the latitude of Alexandria 13 41 12 ============== Diurnal horary times of the first point of Gemini in the latitude of Southern Britain 19° 40′ 10″ Number of temporal hours 12 -------------- 15)236 2 0 -------------- Diurnal equatorial hours of the first point of Gemini in the latitude of Southern Britain 15 44 8 ============== The degree ascending in the ecliptic, at any given temporal hour, may also be ascertained by multiplying the number of temporal hours since sunrise, if the given hour be diurnal, but if nocturnal, since sunset, by their proper horary times; and the product is to be added, in the succession of the signs, to the aggregate number (as shown by the ascensions proper to the climate) of the Sun’s degree, if the given hour be diurnal, but, if nocturnal, to that of the degree diametrically opposite, and that particular degree of the ecliptic which shall correspond with the total number thus found in the ascensions of the climate will be the degree then ascending.[289]