"The Waning Moon" is a short poem written by Percy Bysshe Shelley. A waning moon is the lunar phase in which the moon isn't full, new, or a half moon and it's disappearing--going to a new moon instead of going to a full moo). Because of this, the moon is not a particular shape. Shelley describes the waning moon through this poem that is written as a simile. He says she's like a dying woman, white, shapeless, and fading.
This poem is made up of only one stanza and has six lines. The lines are imperfectly rhymed as AABBCC. The first five lines are written as iambic-pentameter while the final line is written as iambic-triameter.