For her this rhyme is penned, whose luminous eyes,
Brightly expressive as the twins of Leda,
Shall find her own sweet name, that nestling lies
Upon the page, enwrapped from every reader.
Search narrowly the lines!- they hold a treasure
This references  Leda  the mother of the famous twins  Castor and Pollox  who make up the Gemini constellation. 
 
 As Poe gets lost in the twinkle of the stars above, so to does he get lost in the eyes of his lover.
A Valentine