It’s the Hindu calendar system in use since Vedic times.”Panch” means Five, and & Anga & means Limbs.
Based on the lunar cycle, Panchanga considers the position of the Sun and Moon on a day of the year to calculate the right time to undertake important and auspicious events. There are five aspects to Panchanga:
Vaara or the day of the week.Tithi or the Moon’s phase.Karana or half Tithi, or phase of the Moon, further zeroing in on the timing.Yoga is calculated by adding the Sun and Moon’s longitudes and dividing them into 27 parts, of which some are auspicious and the rest not for undertaking work or purpose.Nakshatra or the star the Moon is in at the time under consideration
Other considerations include Hora or the one-hour duration during the day, ruled by a planet, Kalas or further aspects of the day, etc.
All these are analysed to decide the auspicious timing for an event or activity.