Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
अष्टौ वर्षाणि भौमस्य दश सप्त दशा बुधे ।दशाब्दानि दशा पङ्गोरूनविंशद्गुरोर्दशा ॥ राहोर्द्वादश वर्षाणि भार्गवस्यैकविंशतिः ॥ ७९ ॥
In the full Agni Purana this is chapter 121, verse 79.
Mars's dasha (planet period) is eight years. Mercury's is seventeen. Saturn's is ten. Jupiter's is nineteen. Rahu's is twelve years. Venus's is twenty-one.
Simple meaning: Mars has eight years, Mercury seventeen, Saturn ten, Jupiter nineteen, Rahu twelve and Venus twenty-one.
कालः समागणो वक्ष्ये गणितं कालबुद्धये ।
The sum starts here: multiply the years passed by twelve and add the months since Chaitra.
सप्तविंशतिशेषस्तु ध्रुवो नक्षत्रयोगयोः ।
The remainder by twenty-seven starts the star count. Each month adds one weekday and thirty-two time units.
द्वे पिण्डे द्वे च नक्षत्रे नाड्य एकादश ह्यृणे ।
Each month the figures gain two, two and eleven. Add the moon day and divide by seven for the weekday.