Mi Yodeya Stack Exchange
Mi Yodeya Stack Exchange

Questions tagged [calendar]

Questions about calendars. The Jewish calendar is a lunisolar calendar that determines the dates of Jewish festivals.

434 questions
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How does one "add a year" in the Hebrew calendar?

I'm trying to support the Hebrew calendar in my Noda Time project, and need to support an operation of "add a year" - or more generally, answer the question of "Given an original date and a target year number, what's the resulting date?" Firstly,…
Jon Skeet
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How Do I Know If it's a Hebrew Leap Year?

How can I tell if a given year is a Hebrew Leap Year? The simpler, the better. [Assuming we are using a fixed calendar, not like the "olden days".]
yydl
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Making my own Jewish calendar with paper and pencil

I would like to make my own Jewish calendar on paper with pencil ( using the help of programming for the more difficult calculations, ofcourse). How and where do I begin. Who makes the annual Jewish calendar? Who exactly checks to make sure that…
Mars Sojourner
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Salutations or greetings for the various Jewish holidays

Is it right to, and is there a particular salutation for most of the major holidays in the Jewish calendar? I have a couple of new friends who celebrate their Jewish faith, I was wondering if there was a generic salutation or specific salutations…
Gabriel Baker
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What are the 14 types of Jewish Years?

As a way of explanation, I'm working on Objective-C code that calculates parashat hashavua. Initially, I ported the Javascript offered by YYDL as an answer to this question. I've found that my port doesn't hold up in production. I've gone back and…
Moshe
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Calculating Tekufas Teves

Although often associated with the Winter Solstice, Tekufas Teves is an independent date. How is Tekufas Teves, or the other Tekufos (?) determined?
Yirmeyahu
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How is the week referred when there is no parsha read that Shabbat?

Frequently, I have seen on wedding invitations and other correspondences that refer to a date using the parsha name for that week. E.g. an invitation to a wedding may say יום שני בשבת פרשת בא - The second day of the week of parshat Bo. How do they…
DanF
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Why do Kisidran years only occur when starting on a Tuesday or non-leap Thursday?

A careful analysis of the Tur's calendar chart will reveal that the only time the months alternate throughout the entirety of the year (with the exception of Adar Aleph) is if Rosh HaShanah is a Tuesday, or if Rosh HaShanah is a Thursday in a…
DonielF
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Could the Jewish Calendar be changed because of climate change?

It seems that certain parts of the Jewish calendar are based on specific observations. I found this on Wikipedia, about the old observational methods to adding leap months and it made me wonder if there were other areas of Jewish practices that…
ldrg
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How difficult would it be to make a simple Hebrew/Jewish Calendar covering the last 25 years with no access to the Internet?

How difficult would it be to make a simple Hebrew/Jewish Calendar covering the last 25 years using paper and pencils (including days of the week and corresponding Gregorian dates), with no access to the Internet, but knowing the current Hebrew and…
AmethystMaria
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How do non-literalist Jews interpret the "year zero" in the Hebrew calendar?

As I understand, the Hebrew calendar is counted from the "date of creation". Currently you have the year 5774. In the Christian world there are some creationists who also believe that the world is of about the same age, however they are (at least…
Honza Zidek
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Which days the holidays occur on

Has anyone put together a list of how often each event in the Jewish calendar occurs on a given day of the week? For instance, Yom Kippur happens X% on Shabbat, Y% on Monday, Z% on Wednesday, etc.? I saw an answer for fast days, but not for anything…
Daniel Kagan
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Jewish and English birthdays

Can someone explain to me in simple language why my Jewish and English birthday are not on the same day this year. I will be 76 (4 time 19 ). My English is on Tuesday (today) and my Jewish one on Thursday. I was born at night before…
interested
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How does the Hebrew calendar work in areas with midnight sun?

There are two polar circles, the Arctic Circle and the Antarctic Circle. There are days North of the Arctic Circle, and south of the Antarctic Circle where the sun never sets (summer), or never rises (winter). There aren't many people living south…
CG.
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How to calculate exact Gregorian dates of the past Jewish festivals?

I'm reading a book by a Christian author which purports to illuminate some miraculous coincidence between blood moon tetrads and Jewish festivals. One thing that he does without any explanation is that he calculates exact dates of Jewish festivals…
user657
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