The Jewel-Garland of Astrology

...and it was not clearly explained for the distinct movement [of the planets] as stated above. || 10 ||

The sages say that the start of the weekday [begins] from the moment of sunrise in the capital of Ravana original: Ravana-rajadhanyam; refers to the city of Lanka, which in ancient Indian astronomy serves as the Prime Meridian where the equator meets the central meridian. This [time] is adjusted higher or lower from that point by the nadikas a unit of time equal to 24 minutes of the half ascensional difference and the difference in longitude. || 11 ||

Having properly calculated the subtraction or addition of the half ascensional difference Chararddha the time difference between the actual sunrise at a location and the sunrise on the equator and the longitude Deshantara the distance east or west of the prime meridian, the lords of the sages chiefs? have declared the start of the weekday [to be determined] after the time of sunrise. || 12 ||

In the Northern Hemisphere original: saumya-gole, the lords of the sages say the start of the weekday occurs after the rise of the Sun, likewise [it is adjusted] by the half-difference of the solar measures in the Southern Hemisphere. That [value], multiplied by the longitude and divided by four original: veda; the number four is often represented by the word 'Veda' in Sanskrit astronomical notation, [is used] to certainly determine the middle of the earth... [for those in] the West...