neuter
Ogamana (neuter) [o + gam + ana; Sanskrit avagamana. That word is rather more than a thousand years later than the Pāli one. It would be ridiculous were one to suppose that the Pāli could be derived from the Sanskrit. On the other hand the Sanskrit cannot be derived from the Pāli for it was formed at a time and place when and where Pāli was unknown, just as the Pāli was formed at a time and place when and where Sanskrit was unknown. The two words are quite independent. They have no connection with one another except that they are examples of a rule of word-formation common to the two languages] — going down, setting (of sun and moon), always in contrast to uggamana (rising, therefore frequent v.l. ogg° D I 10, 68; Sv I 95 (= atthaṅgamana); Vv-a 326.
ogamana , nt. (= Pali id. ; Skt. ava-ga° not in this sense), going down, setting (of heavenly bodies): Mv ii.163.8 (prose; candrasūryāṇāṃ …) ogamanāni.
going down; setting
(nt, nt, act, from ogacchati) (of the sun, a star or a planet) setting; descending going down [lit.] going down Construction: ava + √gam + ana