Moonrise, Moonset, and night duration are fundamental to the spiritual and astrological framework of Indian Vedic astrology. Certain Muhurtas, like Nishita Kaal, fall during the night and are considered ideal for specific spiritual activities like tantra sadhana or meditation. Night duration affects planetary hours (Hora) and Choghadiya, used to select the best times for specific actions during the night.

Moonrise (चंद्रोदय):

Moonrise is the moment when the Moon becomes visible on the horizon, marking its emergence in the sky. In Vedic astrology, Moonrise timings are significant for events like Purnima (Full Moon) and Amavasya (New Moon). Many rituals, including Chandra Darshan, are based on Moonrise. For instance, Karva Chauth and Sankashti Chaturthi emphasize the exact Moonrise timing for concluding fasts. Moon’s visibility during its phases also impacts astrological predictions, especially for mental health and emotional states.

Moonset (चंद्रास्त):

Moonset occurs when the Moon dips below the horizon, marking its disappearance from view. Moonset timings are equally important for determining auspicious periods during the night. Many Vedic rituals that conclude at night depend on the timing of the Moonset. Additionally, Moonset influences planetary interactions, especially when considering nakshatras (lunar constellations) and the Moon’s transition from one Rashi (zodiac sign) to another.

Night Duration (रात्रि अवधि):

Night duration is calculated from sunset to sunrise, marking the period of nocturnal influences. This duration varies throughout the year due to the Earth's axial tilt and orbital movement. Longer nights in winter and shorter nights in summer have distinct astrological implications.