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22
votes
1answer
2k views

Did Jews in Arab countries ever rely on Islamic calls to prayer?

It just occurred to me that Jews in Arab/Islamic countries would most likely have heard the adhan call the populace to prayer five times a day. Upon looking at an Islamic time-table and doing some ...
4
votes
1answer
40 views

How accurate is the Molad?

To the best of my knowledge the Molad is every 29.5 days + 793 Chalakim. Is there any information showing if the current Molad calculation is accurate scientifically? If it is off by how much is it ...
3
votes
1answer
148 views

Good and Bad Omen - on something that can be calculated in advance

Inspired by Why make a bracha on an earthquake but not on an eclipse? When something can be predicted in advance to an exact moment - for example an eclipse which Chazal say it is a bad Omen (Sukkah ...
7
votes
3answers
978 views

Is maaser calculated pre-tax or after-tax?

I have heard different opinions concerning whether taxes can be deducted before calculating maaser. It is logical to me that if you cannot deduct your expense to live in your house, you shouldn't be ...
5
votes
1answer
225 views

A cryptic Seder HaDoros regarding to the year of Jesus' birth

Regarding the year of Jesus' birth, it says in Seder HaDoros (Year 3724) that the year 3724 and the year (3)532 are really the same. What in the world does he mean? Its in the first column first ...
11
votes
1answer
321 views

When does a day start/end in the far North/South?

As I understand it, a day in the Jewish calendar is from sunset to sunset. How is this handled if you are living so far north or south that you have long periods of daylight or darkness?
7
votes
3answers
278 views

Parashas Shavua calculation

I'm writing a site where the user would be able to see the calendar with jewish-civil translation of dates, and also which parasas shavua falls on which Shabbos. I'd like to know what is the formula ...