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 ||
Тень, измеренная śaṅku (гномоном), должна приниматься как двадцатикратная высота лампы. Затем расстояние между лампой и śaṅku определяют по (вычисленному) свету, устраняющему промежуток вплоть до кончика тени.
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.