FW: Indiana time zones

Paul Eggert eggert at CS.UCLA.EDU
Mon Jan 23 09:10:49 UTC 2006

> From: Andy Lipscomb <AndyLipscomb at decosimo.com>
> Sent: Friday, January 20, 2006 12:39 PM

Thanks for doing all that work.  As you can tell if you are reading
the tz list, I was doing that work independently (and published it
before seeing your email) but I double-checked my work by comparing it
to yours.

First, Shanks says Vincennes and Indianapolis differed in many ways
before 1964.  For example, he says Vincennes observed DST in 1946
and from 1956 through 1963.  I assume you merely copied Indianpolis's
table to Vincennes for time stamps until now, which wouldn't be quite


> In addition to the section above, the new zone will need to be added to
> the zone.tab file. Vincennes' location is
> +384042-0873058.

My proposed patch had +384038-0873143 which is fairly close.  (The LMT
figures also diverged, presumably because of the coordinate
difference.)  My latitude and longitude are from Shanks.

I'm not sure how Shanks (or anyone else) decides where Vincennes "is",
given that one arc second of latitude is only 31 meters or so.

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