Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
भास्करेंद्वो र्भचक्रांत चक्रार्द्धावधिसंस्थयोः । दृक्कल्पसाधितांशादियुक्तयोः स्वावपक्रमौ ॥ १७६ ॥
bhāskareṃdvo rbhacakrāṃta cakrārddhāvadhisaṃsthayoḥ | dṛkkalpasādhitāṃśādiyuktayoḥ svāvapakramau || 176 ||
وأمّا الشمسُ والقمرُ—إذا استقرّا عند نهاية دائرة البروج أو عند حدّ نصف الدائرة—فينبغي تعيين أپكرما كلٍّ منهما (الميل/الانحراف) بتطبيق الدرجات وما يتبعها من القيم المحسوبة وفق دْرِكّكلپا (الطريقة الرصدية).
Sanatkumara (in instruction to Narada, within the Moksha-Dharma teaching that includes Vedanga/astronomical aids)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
It highlights that accurate knowledge (yathārtha-jñāna)—even in technical fields like Jyotiṣa—supports dharma and right timing for sacred acts, which in turn steadies the mind for mokṣa-oriented practice.
Indirectly: by stressing precise reckoning of the Sun and Moon, it supports correct observance of vrata, tithi, and festival timings—frameworks within which Viṣṇu-bhakti and other devotional disciplines are traditionally practiced.
Vedāṅga Jyotiṣa—specifically, computing the Sun’s and Moon’s apakrama (declination) using drik-based (observational) calculations in degrees (aṃśa) and related measures.