one pakṣa opens into

15 tithis (lunar days)

Pakṣa (a Fortnight)
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Pakṣa (a Fortnight) — the Wheel of Vedic Time · पक्ष

Pakṣa (a Fortnight) in the Vedic reckoning of time (Śrīmad Bhāgavatam). It spans 15 days. Half a month — the bright pakṣa as the moon fills, the dark pakṣa as it empties. The bright is the pitṛs’ day, the dark their night. Each tithi is 12° the moon gains on the sun, so 15 tithis = 180° = half a lunar month. A tithi is not a fixed day — it runs ~22–26 hours, which is why tithis are sometimes skipped or repeated.