Get out the microscope, because we’re going through this poem line-by-line.
Lines 49-56
From the fix'd place of Heaven she saw
Time like a pulse shake fierce
Through all the worlds. Her gaze still strove
Within the gulf to pierce
Its path; and now she spoke as when
The stars sang in their spheres.
- From her vantage point, the damsel can see time itself—trippy.
- It looks to her like a pulse (of energy maybe) moving "Through all the worlds" (51).
- She looks into the space below her ("gulf") to follow its "path" through the span of existence (52-53).
- We'd guess that time would be moving from the past into the future, but clearly she's got a different outlook on things.
- That's beside the point anyway—she's about to speak.
- We're not yet told what she says, only that it sounds like stars singing (thanks to both simile and personification). That sounds pretty sweet to us.