Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
यस्मिन्वारे क्षणो वारदृष्टस्तद्वासराधिपः ।आद्यः षष्ठो द्वितीयोऽस्मात्तत्षष्ठस्तुतृतीयकः ॥ १६६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 166.
On any weekday, the first hour belongs to that day's lord. The second is the sixth from him. The third is the sixth from that one.
Simple meaning: The day's first hour belongs to the weekday lord. Each next hour goes to the sixth planet on.
षष्ठः षष्ठश्चेतरेषां कालहोराधिपाः स्मृताः ।
Hour lords follow every sixth planet. Each rules one hour, by day and by night.
वारप्रोक्ते कर्मकार्ये तद्ग्रहस्य क्षणेऽपि सन् ।
Weekday work also does well in that planet's hour. Each star has its own god.
चंद्रेशादितिजीवाहिपितरो भगसंज्ञकः ।
This continues the list of gods who rule the stars, in order.