Paul Gilmartin wrote:

| By the way, the embolismic day in bissextile years
| is February 24, the sixth day before the kalends of March.

Yes and no.  In some medieval versions of what we call the Julian
calendar---It was then called the Roman calendar---February 24th was
duplicated;  there were two of them cheek by jowl in leap years; and
it was not the first February 24th but the the second of them that was
the 'embolismic' day.  (The Julian leap-year test is the simple one,
mod(y,4) = 0.  There is no 2nd-order mod(y,400) = 0 for centurial
years.)

Leap seconds are, among those of us who concern ourselves with these
issues, extracalendrical, for the reasons I set out.  The NIST feed,
which I too have observed, has neither facilities nor time to do
things right by inserting, say,  'extracalendrical leap second' into
is text.

We began on topic, but I think we have already tried the patience of
some, and this is my last post in this thread.

John Gilmore, Ashland, MA 01721 - USA

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