The names of divisions of day or night ending with Locative -7th-case-affix are compounded with words ending with affix kta and the resulting compound is tat-puruṣa ,
As, पूर्वाह्णकृतम् 'done in the morning.' अपराह्णकृतम् 'done in the afternoon.' पूर्वरात्रकृतम् 'done in the first part of the night.' अपररात्रकृतम् 'done in the last part of the night.'
Why do we say 'members or divisions of day and night?' Observe अहनि भुक्तम् 'eaten in the day' रात्रौ वृत्तम् 'occurring in the night.'
This being a continuation of sútra 2.1.32, we have diversely रात्रिवृत्तम् and सन्ध्यागर्जितं.,