Analysis of The Moon and Sea

Whilst the moon decks herself in Neptune's glass
And ponders over her image in the sea,
Her cloudy locks smoothing from off her face
That she may all as bright as beauty be;
It is my wont to sit upon the shore
And mark with what an even grace she glides
Her two concurrent paths of azure o'er,
One in the heavens, the other in the tides:
Now with a transient veil her face she hides
And ocean blackens with a human frown;
Now her fine screen of vapour she divides
And looks with all her light of beauty down;
Her splendid smile over-silvering the main
Spreads her the glass she looks into again.