[LEAPSECS] Leap Seconds schedule prior to 1972

[Tom Van Baak]

> How far back do we have to go before we have multiple leap seconds *per day* ?

Attached are two plots that go back 380k years. The MSL (mean sea level) is from ice core data and the LOD (length of day) is derived. Somewhere in the archives are posts with either these plots or the paper(s) they came from, or other information about LOD, sea level, and climate.

So not a leap second a day, but a leap second a week would be common. Note 100 meter sea level changes are common too.

Realize that these are beyond even "Long Now" sorts of concerns, and probably shouldn't be allowed to impact current leap second proposals or pUTC design decisions.

/tvb
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