Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
कुलिकाश्चोपकुलिका वारवेलास्तथा क्रमात् ।प्रहरार्द्धप्रमाणास्ते विज्ञेयाः सूर्यवासरात् ॥ १६५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 165.
In that order, these are the kulikas (a bad part of the day). Next are the upakulikas (a lesser bad part of the day). Then come the varavelas (a bad time of the weekday). Each lasts half a prahara (three-hour part of the day). Count them from Sunday.
Simple meaning: The numbers above give three kinds of bad time, each an hour and a half, from Sunday on.
यस्मिन्वारे क्षणो वारदृष्टस्तद्वासराधिपः ।
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.