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Well look at how DST regulation changes (about one worldwide every six months) are handled: tzdata is the most underrated project around. I would not be surpris
by Iv 8y ago
Well look at how DST regulation changes (about one worldwide every six months) are handled: tzdata is the most underrated project around. I would not be surprised if islami calendars relied on something similar. In their case it is easier as there are (to my knowledge) not several islamic zones observing different rules.
https://en.wikipedia.org/wiki/Tz_database https://en.wikipedia.org/wiki/Tz_database
- KMag 8y agoYes, that's the Wikipedia link to the timezone database I mentioned. But, latency is the issue. The year doesn't officially change until a Muslim makes the necessary lunar observation on the first evening of the new year. You can't pre-calculate a human observation, so to be in strict compliance, you'd need an efficient way to rapidly distribute the observation. I'm sure that in practice, pre-calculation is almost always used. My question is how this is rationalized in more strict conservative Islamic countries, (or less likely, how they avoid using pre-calculated start of the new year).
- bloak 8y agoI would guess that the people tasked with observing the new moon have a sense of responsibility and know on which day they are expected to observe it, so they do the right thing. It's easy enough to avoid observing the new moon too early: just don't look at the sunset on the day before. Making sure you do observe the new moon on the right day is harder, but if you have several observatories you can probably manage it without self-deception almost every time.