Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
स्वाभीष्टसूर्ये मासार्कादधिके तदृणं स्मृतम् ॥हीने धनं चाब्दपस्य वारादिस्तेन संस्कृतः ॥ १८ ॥
If the chosen Sun is more than the month Sun, that result is held to be minus. If less, it is plus. The year lord's weekday and so on is corrected by it.
Simple meaning: If the chosen Sun is more, take the days away; if less, add them. This corrects the year lord's weekday.
मासवेशे स्फुटा नाड्यस्तद्वारार्थमहर्गणः ॥
At the month entry, find the exact ghatikas. For the weekday, cut the day count by seven and use the corrected year lord's weekday.
वर्तमानो वासरश्च सूक्ष्मं स्यान्मासवेशनम् ॥
This gives the current weekday and the month entry. Another method is taught, from the teachers' words.
मासप्रवेशकालार्कद्युपिण्डोत्थरवेः कलाः ॥
Another method: the minute gap between the two Suns, divided by the motion, gives ghatikas.