Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
विंशकुदीपौच्चगुणाच्छाया शंकूद्धृता भवेत् । दीपशंक्वंतरं चाथ च्छायाग्रविवरघ्नभा ॥ ५८ ॥
viṃśakudīpauccaguṇācchāyā śaṃkūddhṛtā bhavet | dīpaśaṃkvaṃtaraṃ cātha cchāyāgravivaraghnabhā || 58 ||
Bayangan yang diukur dengan śaṅku hendaknya diambil sebagai dua puluh kali tinggi lampu. Lalu jarak antara lampu dan śaṅku ditentukan menurut perhitungan cahaya yang meniadakan celah hingga ke ujung bayangan.
Narada (in instructional mode within a technical/observational passage)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
It highlights that dharma is supported by pramāṇa (reliable measurement): correct observation and calculation are treated as aids to right practice and disciplined living.
Indirectly: by emphasizing precision and order, it supports well-performed religious observances; in Purāṇic practice, careful method strengthens sincerity and steadiness in worship.
Vedāṅga Jyotiṣa-style applied measurement using a śaṅku (gnomon) and shadow-length relationships—useful for observational calculations connected with timing and spatial determination.