[34] idem … mutato nomine: the poet disregards the scientific fact that the same planet is not both morning and evening star at the same season of the year. The identity of Hesperus and Lucifer (cf. Cic. l.c. on v. 1) was known about the time of Pythagoras, whether established by him or by Parmenides, and is freqaently alluded to by the Romans; cf Varr. RR 3.5.17 “stella Lucifer interdiu, noctu Hesperus” ; Cir. 350 [ignem] quem pavidae alternis fugitant optantque puellae (Hesperium vitant, optant ardescere Eoum); Cinna Zmyrna (ap. Serv. on Verg. G. 1.288) te matutinus flentem conspexit Eous, et flentem paulo vidit post Hesperus idem: also
“ Sweet Hesper-Phosphor, double name
For what is one.
”Tennyson In Mem. 121