Page:English translation of the Surya Siddhanta and the Siddhanta Siromani by Sastri, 1861.djvu/34

 and divided by the (above found) becomes the sine of the ascensional difference. The arc of that sine (in minutes) is the ascensional difference in.

. Add and subtract the ascensional difference to and from the fourth part of the length of the day and night of the planet (as found in  59) separately, the results will be lengths of the half day and half night respectively of the planet when its declination is north.

. But when the planet's declination is south, the reverse of this takes place (i. e. the results, just found, will be tbe lengths of the half night and half day of the planet respectively). (In both cases,) twice the results are the lengths of the day and night (respectively).

In the same way, the lengths of the day and night of any fixed star can be determined from its declination which is to be found by adding or subtracting its latitude to or from the declination (of its corresponding point in the ecliptic).

. The (or the space of a  or an Asterism) contains 800′ minutes, and the  of a  (or the space which the Moon describes from the Sun in tithi or lunar day) contains 720′ minutes.

The place of a planet, reduced to minutes, divided by the or 800′, gives the number of those  or Asterisms (counted from  which are passed by the planet: and the remainder is that portion of the present which is passed by the planet.) (This remainder divided) by the diurnal motion (of the planet) gives the quotient in the days,, &c. which the planet has taken to pass that portion of the present.

. The sum of the places of the Moon (found at a given time,)