Moons definition

It was dark, the dual moons high in the sky.

The Solar Equation Occurs Three Times In 400 Years, Namely, In Every Secular Year Which Is Not A Leap Year; For In This Case The Omission Of The Intercalary Day Causes The New Moons To Arrive One Day Later In All The Following Months, So That The Moon'S Age At The End Of The Month Is One Day Less Than It Would Have Been If The Intercalation Had Been Made, And The Epacts Must Accordingly Be All Diminished By Unity.

Do they have anything unusual, like four moons?

It was still dark, and the moons of the underworld hadn't moved far across the sky.  He sat, uneasy with the dream exchange with Death.  A small fire burned between him and Katie, whose pale features and shadowed eyes were showing the effects of both her pregnancy and the toll the underworld took on mortals.

It is not, however, precisely known how they distributed their months of thirty and twenty-nine days, or, as they termed them, great and small moons.