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

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6
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4answers
100 views

History of Shabbat: how (or) did they count to align with 7th day of creation?

The Torah (Exodus 20:8-11) commands: ח: זָכוֹר אֶת יוֹם הַשַּׁבָּת לְקַדְּשׁוֹ: ט: שֵׁשֶׁת יָמִים תַּעֲבֹד וְעָשִׂיתָ כָּל מְלַאכְתֶּךָ: י: וְיוֹם הַשְּׁבִיעִי שַׁבָּת לַה' אֱלֹקיךָ לֹא תַעֲשֶׂה ...
4
votes
1answer
50 views

Illustrated hilchot Kiddush Hachodesh

I remember seeing about 20 years ago a beautiful annotated commentary on Rambam's hilchos kiddush hachodesh, with extensive illustrations and calculations, explained according to both ancient and ...
7
votes
1answer
93 views

Why not two days of Rosh Hodesh, as we have two days of yontif?

The reason for two days of yontif (outside Israel) is based on uncertainty about the date due to distance from Jerusalem and time needed to travel to convey the news of when the month started. The ...
3
votes
0answers
81 views

5 Iyar vs. 10 Adar

In Jewish tradition, we generally commemorate the ends of wars rather than their beginnings (e.g./i.e. Chanuka, Purim). The commemoration of the rebirth of Israel as the Jewish homeland in the past ...
3
votes
2answers
49 views

Why isn't Shabat haGadol held on the 10th of Nissan?

Why is Shabat haGadol celebrated based on day of the week (Shabat) and not day of the month, if it happened on the 10th of Nissan? Most other days of commemoration in Judaism are celebrated by a day ...
2
votes
1answer
69 views

When is Avraham's birthday?

I saw in a popular book a suggestion that Avraham was born on Rosh Chodesh Tevet. Does anyone have any backing sources for this?
1
vote
0answers
105 views

What will Lubavitchers do in 2052?

There's a Chabad-Lubavitch custom of reciting a psalm of T'hilim corresponding to one's age. That is, for example, in one's fourteenth year of life (e.g. on his thirteenth birthday), he says the ...
1
vote
1answer
71 views

When to do “missing” Nissan “Kel Maleh”?

During the month of Nissan, "Kel Maleh" - the prayer for the dead - is not recited. When is it more appropriate for the gabbai to recite it for people who have yahrtzeits during Nissan? Should he ...
1
vote
1answer
43 views

What are the most auspicious times of the Jewish year for contributing money?

What dates/months/seasons (or holidays) are considered most auspicious and/or customary for giving monetary gifts, such as tzedakah? I am aware from my own experience that Purim and erev Yom Kippur ...
3
votes
1answer
96 views

Why are the rules for parsha “catch up” different for leap vs. non-leap years? [duplicate]

When Pesach is on Shabbat, as it is this year and next, the Torah reading in Diaspora is a week behind the reading in Israel for a few weeks. This is because on the 8th day of Pesach which is on ...
1
vote
0answers
33 views

Looking for a computer program or method to list all weekday / Shabbat no-El_Maleh days

My shul has asked me to compile an annual list of all days when "El Maleh" (prayer said for yahrtzeit) is omitted. People in my shul know that it is said any day the Torah is read, meaning Mon., ...
6
votes
0answers
71 views

Is Shushan Purim observed (in theory) in Shush, Iran?

Shushan, Achashveirosh's capital, is identified with the modern Iranian archaeological site of Susa. A city, Shush, has been established nearby. In modern-day Shush, (if any Jews lived there), what ...
1
vote
0answers
43 views

On what days do we say shir hamalos before birkat hamazon?

Concerning saying shir hamalos before birkat hamazon, I have seen three different instructions in various bentchers: On days when we say musaf One days we do not say tachanun When we are celebrating ...
3
votes
0answers
51 views

What if two communities had two different Shabbat days?

Imagine this: One community, A, keeps Shabbat on what we identify as Saturday. However, another community, B, for whatever reason, actually keeps Shabbat on what we identify as Sunday. These two ...
6
votes
0answers
31 views

tehillim division not equal lengths

What is the logic behind the unequal divisions of Tehillim into days of the month; the sections are of very varying lengths i.e. the "longest days" are twice the length of the "shortest days?"
3
votes
2answers
66 views

When did the original names of the months change?

The Haftorah this past week mentions the second month using the name Ziv. The orignal names of the months are discussed here: First-Temple-Era names of the Hebrew months? When did the original names ...
1
vote
1answer
33 views

Based on Talmud Bavli Megillah 30a - 30b, how can we have a break betwen Parshiot Zachor and Parah?

According to what it says in the Talmud, the 3rd of the 4 Shabbatot is Parah, and the Talmud says that this 3rd Shabbat is the one immediately after Purim. In most years this is true. However, this ...
2
votes
1answer
83 views

During Purim Meshulash, why does the Seudah take place on Sunday?

When Shushan Purim falls on Shabbat, residents of Jerusalem spread the observances of Purim over three days: Megillah reading & meshloach manot on Friday, Al HaNissim and Purim Torah reading on ...
0
votes
1answer
90 views

Question about Shemitah years etc [duplicate]

20/01/15 Trying to find out- --I know a "shemitah" is a 7 yr. period. What confuses me is this: how do we know what specific years are the "shemitah" (e.g. Sept./07 to Sept./14 or Sept./08 to ...
1
vote
1answer
75 views

Is secular New Year tree considered OK?

this question presupposes that celebrating secular New Year's eve in the first place is OK. I looked here: " Is it ok to celebrate New Years Eve? " and the answers seemed not fully resolved, but my ...
3
votes
3answers
116 views

Is it ok to celebrate New Years Eve?

Is it ok to celebrate New Years Eve? Which (orthodox, not modox or non-orthodox) rabbinical authority was against it and which one was in favor of it (if such opinions exist).
0
votes
0answers
44 views

Menorah with uneven spacing

The following assumes lighting an additional candle for each day of Chanukkah: Two may light in a single Menorah for the first three days of Chanukkah; each in his end of the Menorah. This does not ...
6
votes
4answers
125 views

What's the point of a haftorah for Miketz if it's always Shabbat Chanukah?

I have heard that parshat Miketz always falls out on Shabbat Chanukah. If that's the case, why do chumashim print a haftorah for Miketz in addition to the one for Shabbat Chanukah? Should the Chanukah ...
2
votes
4answers
208 views

How often does Addar II happen?

I was sitting over dinner with the mispaha (family) talking about the calendar and I said that Addar 2 happens every seven years, but my dad said that it happens every four. So, my question is: how ...
3
votes
2answers
187 views

Hebrew Calender API/Library in PHP or Javascript to add days, month or years to Julian date

I have a web project where I need a function either server-side using php or client-side using javascript where I can pass in a Georgian date and have month(s) or years added to it according to the ...
2
votes
1answer
138 views

Looking for a Niddah Calendar calculator

I am looking for a program that calculates the different significant dates for hilchos Niddah based on the information you give it. My criteria are as follows: Must be free Must be PC compatible ...
-1
votes
1answer
30 views

Why were leap years decided only by judges and not with the cooperation of witnesses?

Ramba"m Hilchot Kiddush Hachodesh 4:9 says: The year can be made full only by [judges] who were invited [to participate in the deliberations]. What is implied? The head of the High Court tells ...
1
vote
1answer
182 views

Is is prefered to have the Pasach meal on the first or second night?

I remember being told that the Seder can be on either the first or second night. Is this true, and if so, is it prefered for it to take place on one over the other, or are they both equal? Edit: The ...
2
votes
3answers
47 views

Rambam Kiddush HaChodesh - Chapter Six - halacha 5

a copy of a few lines from the halacha: Similarly, when the days of a lunar year are counted in groups of seven, according to the weekly cycle, there is a remainder of four days, eight hours, and 876 ...
2
votes
0answers
33 views

Concerning the time when Esther must be read

The first Mishnah in Tractate Megilla says: מגילה נקראת באחד עשר, בשנים עשר, בשלושה עשר, בארבעה עשר, ובחמישה עשר--לא פחות ולא יתר. The Megilla is read sometimes on the 11th, 12th, 13th, 14th, ...
4
votes
2answers
126 views

Why not say tachanun until 2 Cheshvan?

It's recorded in most siddurim I've used that some people have the custom to skip tachanun on Isru Chag (the day after Sukkos), and start again the day after, while others don't resume saying it until ...
-1
votes
1answer
34 views

Pshat in Pasuk of Velo Yavor

Chazal say that the reason why we don't read the Megillah on the 16 is because the passuk (Esther 9:27) says "velo yavor" - וְלֹא יַעֲבוֹר. Why is there a need for this Passuk? The Megillah said that ...
8
votes
2answers
230 views

How can I identify which dates Jewish holidays/special days fall on?

Not being Jewish I scheduled an event this year, only to learn shortly before it occurred that the date was a Jewish Holiday and so I had essentially excluded Jews. I live in the United States, and ...
0
votes
1answer
35 views

Why is Rosh Hashana two days in Jerusalem?

Rosh Hashana is the only festival celebrated for two days even in Jerusalem, since there was a possibility that witnesses for the new moon would come in the middle of the day and the Beis Din would ...
-2
votes
1answer
3k views

What are the exact Shmita dates (in Gregorian) since 1900 or a general formula for determining the dates?

I know there are these two questions already (Trying to get Shmita year dates without a headache) and (When is the next shmita year (as of 5772)?); however, they don't appear to provide either a table ...
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 ...
4
votes
1answer
286 views

When was the last time the “Leap Year” postponement rule was used to delay the date of Rosh Hashannah?

This site explains that there are 4 rules that would cause Rosh Hashannah to be postponed 1 or 2 days after the date of Molad Tishrei. You can view all 4 rules on the web site, but rule 4 states: ...
5
votes
3answers
254 views

Why is the day of Rosh Chodesh announced before every month except Tishrei?

Why is Tishrei the only month not included in the custom of announcing the day(s) of Rosh Chodesh on the Shabbos before the month begins?
2
votes
0answers
43 views

Did the people who followed the triennial cycle celebrate “Simchat Torah” in the same manner as those who followed the annual cycle?

I noticed this related question that briefly discusses Simchat Torah, but it mainly answers those that follow the annual cycle. People following the annual cycle clebrate Simchat Torah on a Yom Tov ...
1
vote
2answers
629 views

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 ...
4
votes
1answer
295 views

When is Musaf said?

When is the Musaf said? I know it is part of the Shacharit service. I mean when as in what holidays, fast days, etc... Would you say it on Tisha B'av for example. If not, why? At the end of ...
3
votes
1answer
52 views

Splitting the Double Parshiyot

As far as I can remember, during the course of the year there are eight sets of parshiyot that are sometimes joined together: תרומה תצווה ויקהל פקודי תזריע מצורע אחרי מות קדושים בהר בחקותי חוקת בלק ...
2
votes
2answers
107 views

Secular Names for Days of the Week

Is there a problem using the secular names for the days of the week? If so, is it 1) because they originally come from Polytheistic gods or 2) simply because the people forbidding them are of the ...
5
votes
1answer
76 views

When was the last time when we had 4 consecutive leap years when Matot and Masei were read separately?

I noticed that the only times that parshat Matot and Mas'ei are read separately outside Israel is during a leap year when the first day of the previous Rosh Hashannah occurred on Thursday. This would ...
6
votes
4answers
275 views

Is it permissible to write the English/secular date?

Is it permissible to write the secular/Christian date? Example: On a letter (bad example but you get what I mean). Some conceivable issues: We're told "this month (Nisan) shall be for you the head ...
1
vote
1answer
109 views

Churban Bayis Sheini Not on Tisha B'Av?

I recently heard that the destruction of the 2nd Temple was not actually on Tisha B'av, the date of the destruction of the 1st Temple, but that it was pretty close, so the rabbis had it commemorated ...
15
votes
2answers
900 views

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 ...
3
votes
0answers
78 views

Cutting nails before Yom Tov

BSD I know that it says in Shulchan Aruch one shouldn't cut one's nails on Thursday (really two days before Shabbat) in deference to the Shabbos. Does this apply to Yom Tov as well? Meaning, should ...
2
votes
0answers
52 views

Is there a reference that explains the literal meaning and etymology of the names of the Hebrew months?

Is there a reference that explains the literal meaning and etymology of the names of the Hebrew months? I am looking for something that explains both the common Babylonian names as well as the Tana"ch ...
3
votes
2answers
94 views

Why isn't Hallel recited on VE Day?

There is a good deal of controversy about reciting Hallel on days not ordained by ancient tradition. But there are at least some opinions that Hallel should be recited to commemorate dates of ...