[tz] Shanks about Ontario

Alois Treindl alois at astro.ch
Fri Jan 24 13:24:33 UTC 2020

I believe the Shanks data for Ontario are rather messy and not fully 

He lists a lot of places all over Ontario (about 250) which according to 
him follow the same time zone history as tz zone America/Nipigon

I think considerable local research is needed to sort out pre-1970 
Ontario time zone history.

Shanks describes 116 different rule sets for Ontario. I attach screen 
shots from klm files on Google Earth showing how the towns listed for 
Ontario by Shanks are locally distributed.

Label (5) represents the Shanks rule set which corresponds to TZ rule 
set America/Nipigon, while according to TZ the zone
America/Nipigon is a tiny area.

On 17.01.20 10:01, Paul Eggert wrote:
> On 1/13/20 8:15 AM, Jeffery Nichols wrote:
>> I was also wondering whether anyone on your team has more data about
>> what towns were part of America/Nipigon.
> I got that data from my printed copy of the Shanks International 
> Atlas. It contains hundreds of place names in Canada but does not sort 
> them by time zone region. I just now looked in Shanks (4th edition) 
> for place names beginning with "A" with the same time zone history as 
> Nipigon (Shanks calls this Canada's region 35), and found the following:
> Alfred
> Algoma Mills
> Algonquin
> Almonte
> Alvinston
> Appleton
> Apsley
> Arden
> Armstrong
> Armstrong Station
> Aroland
> Attawapiskat
> Auburn
> The book has latitude and longitude for each of these entries. It 
> would take some time to transcribe all this info (including B-Z) for 
> all of Canada. Also, Shanks partitions the world into many more 
> regions than tzdb does, because he doesn't have the 1970 cutoff that 
> tzdb does. So he partitions Canada into 253 regions and there could be 
> other Shankian regions that share Nipigon's post-1970 time zone 
> history and would thus fall under America/Nipigon in tzdb.

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