31256: Inconstant Moon

[Anableps]

Shakespeare does use the phrase.

Romeo and Juliet, Act 2, Scene 2

ROMEO: Lady, by yonder blessed moon I swear
That tips with silver all these fruit-tree tops--

JULIET: O, swear not by the moon, the inconstant moon,
That monthly changes in her circled orb,
Lest that thy love prove likewise variable.

[JH]

Thanks.