A Yoga in the Panchang context is one of 27 divisions based on the sum of the Sun's and Moon's sidereal longitudes. Each Yoga spans 13°20' of this combined longitude. Unlike its namesake in physical practice, Panchang Yoga is purely astronomical — it reflects the combined energy of the two luminaries.

Yoga = floor((Sun longitude + Moon longitude) / 13.333°) + 1. The sum increases as both bodies move forward. Since the Moon moves much faster than the Sun (~13° vs ~1° per day), the sum increases by ~14° daily — roughly one Yoga per day. The 27 Yogas have varying qualities from highly auspicious (Siddha) to inauspicious (Vyaghata).