161. Turn a new side, etc.: the side turned away from the earth
which our world never sees.
163. Zoroaster: (589-513 B. C.), founder of the Persian religion,
and worshipper of light, whose habit it was to observe the heavens
from his terrace,
164. Galileo: (1564-1642), constructor of the first telescope,
leading him to discover that the Milky Way was an assemblage of
starry worlds, and the earth a planet revolving on its axis and
about an orbit, for which opinion he was tried and condemned. When
forced to retire from his professorship at Padua, he continued his
observations from his own house in Florence.
164. Dumb to Homer, dumb to Keats: Homer celebrates the moon in the
"Hymn to Diana" (see Shelley's translation), and makes Artemis
upbraid her brother Phoebus when he claims that it is not meet for
gods to concern themselves with mortals (Iliad, xxi. 470). Keats,
in "Endymion," sings of her love for a mortal.