The affix luṅ (Aorist) comes after a verbal root used in the sense of past before the commencement of the current day.,
The word अनद्यतन is a Bahuvrihi compound, meaning that which has not occurred during the course of the current day (adyatana). The whole of this affix is replaced by conjugational terminations, and the affix लङ् by itself denotes the Imperfect tense. As अकरोत् 'he did'; अहरत् 'he took'.
Why have we explained anadyatana as a Bahuvrihi compound? Because when there is a doubt as to the time, whether it was to-day or yesterday, there the Imperfect should not be used. As अद्य ह्यो वा अभुञ्ज्महि 'we ate to-day or yesterday'. In such a case the affix is लुङ्.
Vart:- The affix लङ् is also employed in signifying what is not witnessed by the narrator, when it relates to a well-known public event which can form the object of perception by the narrator. Thus in speaking of a recent public occurrence we may say :-अरुणद् यवनः साकेतम् 'the Yavanas have besieged Saketa'; अरुणद् यवनः माध्यमिकान् 'the Yavanas have besieged Madhyamika'.
Why do we say 'not witnessed by the speaker'? Observe उदगात् आदित्यः 'the sun arose'. Why do we say 'a popular public event' ? Observe चकार कट देवदत्तः 'Devadatta has made the mat'. Why do we say 'which is the object of perception by the speaker'? Observe जघान कंसं किल वासुदेवः 'Vasudeva killed Kansa'.,