ĀpŚS, 6, 4, 10.1 yad udite juhoty agniṣṭomaṃ tenāvarunddhe yan madhyaṃdine juhoty ukthyaṃ tenāvarunddhe yad aparāhṇe juhoti ṣoḍaśinaṃ tenāvarunddhe yat pūrvarātre juhoti prathamaṃ tena rātriparyāyam āpnoti yan madhyarātre juhoti madhyamaṃ tena rātriparyāyam āpnoti yad apararātre juhoti jaghanyaṃ tena rātriparyāyam āpnoti //

ĀpŚS, 10, 17, 3.1 madhyaṃdine madhyarātre ca vratayati //

ĀpŚS, 20, 6, 6.1 savitre prasavitra ekādaśakapālaṃ madhyaṃdine /