I'm going from memory, but these numbers seem somewhat amiss. Isn't the length of the year 365.2499? Aren't there additional corrections beyond those mentioned, perhaps if the year is divisible for 4000 (again, I'm just going from memory)? And won't it take longer than 3/4 of a billion years for the earth's rotation to equal its lunar month (I didn't do the math, but it seems inconsistent with other data)?
--Percy