"the feeble light of a broken moon"

The moon, probably as Frank sees it
GNU Free Documentation LicenseThe moon, probably as Frank sees it - Credit: 阿爾特斯
The moon is obviously not full, so the light coming from it is not too bright. The moon's face changes during the month as its surface is hidden by the earth. The parts not hidden by our planet reflect the sun, and this is the shine that we see from earth. Click here for more about moon phases.