Plato, Epinomis 990b

ἑκάστης οὕτως ὡς οὐκ ἂν ῥᾳδίως ποτὲ πᾶσα φύσις ἱκανὴ γένοιτο θεωρῆσαι, μὴ θαυμαστῆς μετέχουσα φύσεως. ὃ νῦν εἰρήκαμεν ἐροῦμέν τε, ὥς φαμεν, ὅπῃ δεῖ τε καὶ ὅπως χρεὼν μανθάνειν· πρῶτον δʼ ἡμῖν τόδε λεγέσθω. σελήνη μὲν περίοδον τὴν αὑτῆς τάχιστα διέξεισιν, ἄγουσα μῆνα καὶ πανσέληνον πρώτην· δεύτερον δὲ κατανοεῖν δεῖ τὸν ἥλιον, τροπὰς ἄγοντα διὰ πάσης τῆς αὑτοῦ περιόδου, καὶ τούτῳ τοὺς συνδρόμους. ἵνα δὲ μὴ πολλάκις ταὐτὰ περὶ

could not ever be easily observed by any ordinary nature, that did not partake of a marvellous nature. As to this, we have now told, and shall tell, as we profess, by what means and in what manner it ought to be learnt; and first let us make the following statement. The moon travels through its orbit very swiftly, bringing first the month and full-moon; and in the second place we must remark the sun, with his turning motion through the whole of his orbit, and with him his satellites. But to avoid repeating again and again the same things on the same subjects