[tz] netherland timezone UTC offset (0:19:32.13) history

[Tim Parenti]

On Mon, 5 Aug 2024 at 12:09, Eitan Adler via tz <tz at iana.org> wrote:

> I'm interested in some specific timezone history.  Specifically I'm
> curious about the origin of 'STDOFF 0:19:32.13'.   Does anyone have an
> authoritative source for where this is derived from?
>

For one example, the backzone entry for Europe/Amsterdam contains the
following comment:

# The data entries before 1945 are taken from
# https://www.staff.science.uu.nl/~gent0113/wettijd/wettijd.htm

Section III of that webpage (in Dutch) has a subsection entitled "Eenheid
van tijd in Nederland" ("Unit of time in the Netherlands") which states
that, though the law did not specify the Amsterdam meridian, there was a
general understanding to use "the meridian of the Westertoren (4° 53'
01.95" east longitude), corresponding to a time difference of 19 minutes
32.13 seconds with UT. However, for the sake of convenience, a rounded
value of exactly 20 minutes was usually used."

That page is the responsibility of Robert Harry van Gent and is hosted
by the Faculty of Science at Universiteit Utrecht.

--
Tim Parenti
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