The dashas celebrated as Shatabdika span a hundred years of life; they are to be known by the order of the nakshatras of the planets that dispense destiny.
Verse 3 — Computation from Nakshatra Balance
जन्मनक्षत्रयोगेन ग्रहस्याद्या तु या दशा ।
अवशिष्टं तथा तस्याः शेषकालफलं भवेत् ॥ ३॥
By conjunction with the nakshatra at birth, the first dasha belongs to its ruling planet; the balance remaining in that dasha is then computed, and results operate for that remaining measure of time.