Greek Anthology Book XIV: Metrodorus: 140

Arithmetical Epigram of Metrodorus
Blessed Zeus, are these deeds pleasing in thy sight that the Thessalian women do in play? The eye of the moon is blighted by mortals; I saw it myself. The night still wanted till morning twice two-sixths and twice one-seventh of what was past.

Solution
Let $t$ be the time since sunset.

It is assumed that the night is $12$ hours long.

We have:

So $6 \frac 6 {41}$ hours have passed since sunset.

That leaves $12 - 6 \frac 6 {41} = 5 \frac {35} {41}$ hours remaining till sunrise.