If I were Pope Gregory’s advisor, I’d urge this: all months to have 30 days until the first (or last) of some month falls on a solstice or equinox; thereafter, alternate 30, 31, 30, 31, 30, 31, 30, 31, 30, 31, 30, 30¼.

Unrelated link: Questioning 7/4

Well what d’ya know. You make a casual post to alt.language.artificial about leap-seconds and before you know it someone sends links on the subject: The Future of Leap Seconds; Extrapolations of the difference ( TI – UT1 ); Time Scales. Thanks Steve!