Hayanaratna · by Balabhadra
Chapter 7 · Finding the Dashas
दशानयनाधिकाराध्यायः
उभे तु वर्षाद्रि ७ बलेन निघ्ने शरोकृतेस्तंगतगम्यमाने ॥दिनादिके आदिदशाधिपस्य गम्योन्मितादौ तु दशा हि तस्य ॥ ४ ॥
Multiply both by a seventh of the year. Divide by five. These are the passed and coming parts of the first period lord, in days and so on. At the start, its period equals the coming part.
Simple meaning: Kalahora periods: the first lord's period is split into a part to come, at the start, and a part passed.
परा परेषान्तु यथास्थितास्स्युर्गतोन्मिता चेति दशा हि तस्य ॥
Kalahora periods: the others keep their full share; the first lord comes back at the end. Month and day use their own spans.
अत्रोदाहरणम् ॥ तत्र श्रावणवदि नवर्म्यां शुक्रवासरे उदयाद्गतघटीपलेषु ५।३६ वर्षप्रवेशः । तत्र रविः ३।९।३६ दिनमानं ३३।३०
Kalahora example: the year starts on a Friday in Shravana, 5 ghatikas 36 palas after sunrise. The day is 33;30 long.
अत्र कालहोरेशानयनार्थं वारप्रवृत्तिनयनार्थं सुगमोपायो मिश्रकृतः॥
Start of the weekday: distance from the meridian, less a quarter, is added to 45 ghatikas, then half the day is added.