[LEAPSECS] civil-solar correlation with TI

[Tony Finch]

On Sun, 28 Dec 2008, Poul-Henning Kamp wrote:

>

> In addition to the Olsen database, the book "Calendrical Calculations"

> is probably required.


"Calendrical Calculations" isn't a reliable source for historians in the
way that the Olson database tries to be. CC is a mechanized description of
how calendars are supposed to work, not a record of how they are actually
used. This is particularly important for observational calendars such as
the Islamic calendar where practice can and does differ from theory. The
tz database attempts to record what timezones were actually used in
different places at different times.

Tony.
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