Early One Christmas Eve . . .
"So your year starts on a different day every year?"
Ice grinned over at the older of his foster children. "Right. On the first new moon after the Winter Solstice. And if there's a new moon just before the Solstice we have . . .do you have leap years? Yes, well, we have like, a leap month. Because all months are lunar so we have an extra . . . nine or ten days a year, something like that, and when the days accumulate up to the Eid--the new moon that ends Ramadan--happening before the solstice, we plug an extra month onto the end of the year. It happens every three or four years."
Lada shook her head slowly. "A lunar month is, what? A little over twenty-nine and a half days? Every time I start thinking the Empire of the One is a marvelously advanced society I run head on into a primitive superstitious . . ."
A sharp voice from a cupboard. "But when be Christmas?"
Ice blinked. "Do you know, I haven't thought about Christmas for decades . . . but four days after the Winter Solstice . . . One! This is Christmas Eve!"