Lunacy for Lunatics

Glancing at the setting Sun and--snap, snap, snap (now, almost a habit)--I was getting ready for some late-night book editing. 

That is, until I realized that the Moon-Lay-Hidden-Beneath-a-Cloud (yes, like the excellent band) was generating a lunar rainbow, the second one I've seen in my entire life!

Unlike the one from last year, I was better prepared: 

Gaius Julius Caesar Augustus Germanicus, also known as Caligula, had the habit of talking to the full Moon. (See Suetonius, "Caligula," The Twelve Caesars  [New York: Penguin, 1979], 161.)

Yet I strongly suspect he would have appreciated this half-Moon lunacy, too!