Analysis of Sonnet 14: “Not from the stars do I my judgement pluck…”

Not from the stars do I my judgement pluck,
And yet methinks I have astronomy,
But not to tell of good, or evil luck,
Of plagues, of dearths, or seasons' quality,
Nor can I fortune to brief minutes tell;
Pointing to each his thunder, rain and wind,
Or say with princes if it shall go well
By oft predict that I in heaven find.
But from thine eyes my knowledge I derive,
And constant stars in them I read such art
As truth and beauty shall together thrive
If from thy self, to store thou wouldst convert:
Or else of thee this I prognosticate,
Thy end is truth's and beauty's doom and date.