But it's really not even close to "about 7 days per lunar quarter," at least not close enough that using the calendar can tell you anything useful about when fu

But it's really not even close to "about 7 days per lunar quarter," at least not close enough that using the calendar can tell you anything useful about when future new moons will be. Even if you're just looking ahead 4 weeks you'll already miss the new moon by a day and a half!