Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
ग्रहाधीना नरेन्द्राणामुच्छ्रयाः पतनानि च ।भावाभावौ च जगतस्तस्मात्पूज्यतमा ग्रहाः ॥ १४ ॥
In the full Agni Purana this is chapter 164, verse 14.
The rise and fall of kings depend on the planets. So do the birth and loss of the world. So the planets are the most worthy of worship.
Simple meaning: Kings rise and fall by the planets, so the planets deserve worship.
वारव्रतानि वक्ष्यामि भुक्तिमुक्तिप्रदानि हि ।
The weekday vows start here. On a Sunday in Hasta or Punarvasu, a bath with all herbs is good.
श्राद्धी चाऽऽदित्यवारे तु सप्तजन्मस्वरोगभाक् ।
A Sunday ancestor rite keeps illness away for seven births. A Sunday on a sankranti is good.
कृत्वा हस्ते सूर्यवारं नक्तेनाब्दं स सर्वभाक् ।
A Sunday vow in Hasta for a year gives everything. Seven Mondays in Chitra bring happiness.