What the vyāhṛtis bhūḥ, bhuvaḥ, svaḥ are, how the Upaniṣads say they were distilled from the three Vedas, the fourth and the seven vyāhṛtis, and their place in the Gāyatrī, sandhyā and homa.

Tracing the Gāyatrī from Ṛgveda 3.62.10 through the Yajurveda, the Upaniṣads and the Smṛtis to upanayana and sandhyā — and why the mantra of Savitṛ matters to a Jyotiṣī. With an index of sources and a glossary.

Where the Vedic metres come from, what Piṅgala's Chandas Vedāṅga contains, how a metre is built, which great works use which metres, where to study further — and the two places the Jyotiṣa classics actually touch chandas.