        Twilight began frantically scribbling on a piece of paper, occasionally consulting the calendar.  After a minute, she looked up.  “With three hundred sixty-six days, the only even lunar cycle they could have that makes any sense at all is sixty-one days.”  She frowned.  “It almost works—the months tend to be paired in thirty-one and thirty day groups.  But the second month should have one more day, and the seventh should have one fewer.  If that were the case, it would work.  Although the pattern would go from long/short to short/long at the halfway point.”