amāvāsyāamā-vāsyā, f. (fr. rt. vas, ‘to dwell,’ with amā, ‘together,’ i. e. rātri, night of new moon), the first day of the first quarter on which the moon is invisible; a sacrifice offered at that time; the sacrificial cake ?; (as, ā, am), or amā-vāsyaka, as,ā, am, produced in a night of new moon.
amā—vāsyā̂a (-vāsyā̂), f. (scil. rātri; fr. √ 5.vas, ‘to dwell’, with amā́, ‘together’) the night of new moon (when the sun and moon ‘dwell together’), the first day of the first quarter on which the moon is invisible, AV.; ŚBr. &c.
Amāvāsyā — the time when Pitṛs worship moon and when the sun, moon and constellations meet together in the same maṇḍala; Pitṛs drink the nectar of the moon (1/15) part of it remaining; there is no moon, middle sun — half night half day.1Yajñas with 21 samjñas.2 Only when two of its kalas remain, the moon enters the orbit of the sun and stays in the ray called Amā and hence the period is Amāvāsyā,3 fit for śrāddha.4[Footnote] 1) Br. II. 10. 62. 65; 21. 153; 23. 70; 28. 6; 17. 19; M. 17. 2; 126. 66. 72; 141. 42-49; Vā. 52. 64; 53. 92; 56. 1, 6, 42 and 49 [Footnote] 2) Br. III. 11. 14. Vā. 74. 13. [Footnote] 3) Vi. I. 20. 38; II. 8. 80; 12. 8; III. 14. 7-10. [Footnote] 4) Vi. III. 14. 7-10.