सूर्यरथनिर्णयः (चन्द्रस्य पक्षवृद्धिक्षयविधानम्)
ततः पञ्चदशे भागे किंचिच्छिष्टे कलात्मके अपराह्णे पितृगणा जघन्यं पर्युपासते
tataḥ pañcadaśe bhāge kiṃcicchiṣṭe kalātmake aparāhṇe pitṛgaṇā jaghanyaṃ paryupāsate
അതിനുശേഷം കലാമയമായ പതിനഞ്ചാം ഭാഗത്തിൽ, അപരാഹ്നത്തിൽ അല്പം ശേഷിക്കുമ്പോൾ, പിതൃഗണങ്ങൾ ആ ജഘന്യമായ—അഥവാ ശേഷഭാഗത്തെ—കാത്ത് ഉപാസനയായി സമീപിക്കുന്നു।
Suta Goswami
It fixes the ritual timing (aparāhṇa) when Pitṛ-related rites are effective, helping a Shaiva householder harmonize Śiva-pūjā with dharma—honoring Pitṛs while maintaining purity and order in daily worship.
Indirectly, it presents Śiva-tattva as the Lord of kāla (time): when rites are aligned with the proper divisions of time, the pashu (individual soul) reduces pasha (bondage) through disciplined observance under Pati’s cosmic order.
Ritual discipline in Pitṛ-tarpaṇa/śrāddha timing is highlighted—performing offerings in aparāhṇa, when the Pitṛs are said to be near and receptive to the rite’s subtle efficacy.