Āpastambagṛhyasūtra with Haradatta's Anākulāvṛtti and Sudarśana's Gṛhyatātparyadarśanavyākhyā (with commentary) · Chapter 24

navamaḥ khaṇḍaḥ
2. ṛtugamanakālaḥ /
caturthiprabhṛtyāṣoḍaśīmuttarāmuttarāṃ yugmāṃ prajāniḥśreyasamṛtugamana ityupadiśanti // Ā
COMMENTARIES:
ĀpGs-Anā_9.1:
ṣoḍaśīmiti pañcamyarthe dvitīyā /
āṣoḍaśyā ityarthaḥ /
āṅcābhividhau /
rajasaḥ prādurbāvādārabhya caturthīṣoḍa śyau gṛhyete, prakaraṇāt /
caturthīprabhṛtyāṣoḍaśyāḥ sarvā rātraya ṛtugamanakālāḥ /
tatrāpi uttarāmuttarāṃ yugmāṃ rātriṃ prajāniśśreyasaṃ vidyāditi /
ṛtugamana iti vacanāt vaivāhike prathamagamane satyapi ṛtunimittenāyamupadeśaḥ pravartate /
caturthyā apārarātre niyamena gamanaṃ bhavati /
tatra ca śeṣaṃ samāveśane japet /
uttarābhirabhimantrayata iti ca gamanamantrāṇāṃ samuccayo bhavati /
tatra pūrvamṛtugamanamantrāḥ /
paścāt samāveśanamantrāḥ /
viparītamanye