तदेव लग्नं सुदिनं तदेव
ताराबलं चंद्रबलं तदेव |
विद्याबलं दैवबलं तदेव
लक्ष्मीपते तेंघ्रियुगं स्मरामि || ||
That alone is the best time, that only is the best day,
that time only has the strength bestowed by stars, moon,
knowledge and Gods, when we think of the feet of Lord
Vishnu who is the spouse of Goddess Lakshmi.

Jyotish or Jyotir Vidya (the Lore of Light), is the study of all facets of the ‘lords of light’: the Sun, Moon, planets and stars. There are six limbs to Astrology, just as there are six Vedangas for the Vedas. According to Prashna Marga, a text on horary astrology, an astrologer has to be conversant with all six branches of astrology such an astrologer is known as a true daivajna (roughly, ‘a knower of God’s intention’).