ἐπιτολή
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
English (LSJ)
ἡ, (ἐπιτέλλω (B))
A the rising of a star, ἄστρων E.Ph.1116 (pl.), cf. Archyt.I, Ptol.Alm.8.4 : hence, the season of a star's appearance in the heavens, Hp.Aër.2, Thphr.CP2.19.4, etc.; Ἀρκτούρου Th. 2.78 (pl.); Κυνός Arist.HA602a26 ; τῆς Πλειάδος Plb.4.37.2 ; later of the sun or moon, App.BC5.90, Philostr.VA6.4 (pl.), Artem.1.3 (pl.):—as explained by Gem.13.3, ἐ.=rising (ἀνατολή) of a star as the sun rises or sets (ἐ. ἀληθινή, ἑῴα ἢ ἑσπερία), or just before sunrise or after sunset (ἐ. φαινομένη). 2 rising of the wind, Palaeph. 17 (pl., s.v.l.) ; rise or source of a river, or perh.=ἐπιπολή 1.1, dub.l.in GDI 5075.52 (Latos).
