Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
रेवती दशरात्रं च अहोरात्रं तथाऽश्विनी ।भरण्यां प्राणहानिः स्याद्गायत्रीहोमतः शुभम् ॥ ७७ ॥
In the full Agni Purana this is chapter 121, verse 77.
Revati: ten nights. Ashvini: one day and night. Bharani: the verse says it takes the life. A fire offering with the Gayatri brings good.
Simple meaning: Revati takes ten nights, Ashvini one day. Bharani can bring death. A Gayatri fire offering helps.
पञ्चधान्यतिलाज्याद्यैर्धेनुदानं द्विजे शमम् ।
Offer grain, sesame and ghee, and give a cow to a Brahmin. The Sun's period is eight years, the Moon's fifteen.
अष्टौ वर्षाणि भौमस्य दश सप्त दशा बुधे ।
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.