Bhava Kutuhala · by Jivanatha Daivajna
Chapter 16 · Planet Periods and Dashas
दशाफलाध्यायः
गतर्क्ष नाडीनिहता दशाब्दैर्भभोगनाड्या विहृता फलं यत् ।वर्षादिकं भुक्तमिह प्रवीणैर्भोग्यंदशाब्दान्तरितं निरुक्तम् ॥ ३ ॥
Take the part of the nakshatra (star) already passed, in nadis. Multiply it by the years of the period. Divide by the full length of the nakshatra in nadis. The answer, in years and smaller parts, is the part of the period already used. The skilled call the rest, the period's years minus that, the part still to come.
Simple meaning: Multiply the passed part by the period's years. Divide by the full length. The rest is still to come.
दशा दशाहता कार्या विहृता परमायुषा ।
Multiply period by period and divide by 120 years. This gives the sub-periods. The sub-sub-periods use the same ratio.
उद्वेगिता हृदि ततो परितो लताव
The Sun's period tends to bring worry, quarrels with kin over property, loss of wealth and illness.
सदा पाके राकेशितुरधिकृतिर्भूपतिकृता
The Moon's period tends to bring power from a king, good company, joy, ornaments, a house, love and comforts.