On Arcturus looks from high
The rosy-finger’d morn.]
By this is understood the heliacal rising of Arcturus, which happened in the time of Hesiod about the 21st of September. Le Clerc.
On morning’s brink
The Pleiads, Hyads, and Orion sink.]
This is the morning, or cosmical, setting of the Pleiads; which, according to Petavius, happened some time in November. Le Clerc.
[119] Then varying winds.] Virgil cautions the navigator against the appearances of the sun, Georg. i. 455:
If dusky spots are varied on his brow