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davedelong / calendar_fallacies

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An hour is always 60 minutes fallacy #9

Open MosheBerman opened 7 years ago

MosheBerman commented 7 years ago

The Hebrew calendar defines an hour as 1/12 of the number of sunlight minutes in a day. (Wikipedia covers this - I totally forgot earlier, but this fallacy is the entire basis of KosherCocoa)

davedelong commented 7 years ago

Is that also true in code? Like, does ICU get that right?

MosheBerman commented 7 years ago

ICU can't account for this without have sunrise and sunset calculation algorithms built in.

As noted in #8, the Israeli Hebrew calendar is different than the religious application of it, in that it uses fixed times. (For example, the busses run on a regular clock, but the actual Hebrew calendar has these adjustable hours.)

MosheBerman commented 7 years ago

I recently learned that Japan once had a system like this. It's mentioned briefly here on Wikipedia, and Google has lots of information about the Japanese Temporal Clock:

https://en.m.wikipedia.org/wiki/Japanese_clock

Here's a pretty good article with pictures:

http://museum.seiko.co.jp/en/knowledge/wadokei/index.html

Like the Hebrew Calendar, I'm not sure ICU/NSCalendar handle this.