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Questions tagged [time]

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26 votes
6 answers
5k views

Moshe's age and the timeline of the exodus

Moshe was 80 when he approached Par'o before the makos, and the makos lasted a year, so he turned 81 in the Adar before the Jews left Mitzrayim. As he turned 120 in the Adar before the Jews entered ...
msh210's user avatar
  • 73.5k
29 votes
12 answers
2k views

How can I make a long summer shabbat a delight?

Where I live, shabbat ends at nearly 10PM at the peak of summer, and I find it challenging to get to the end of that without starting to develop some negative feelings. I try to spend most of Shabbat ...
Monica Cellio's user avatar
25 votes
10 answers
4k views

Time Travel and Judaism

Has time travel ever been discussed before in terms of Judaism? According to Judaism would (should) it be possible to travel through time?
yydl's user avatar
  • 38.6k
11 votes
1 answer
560 views

Group coordination for a siyum

My understanding is that a siyum should be made on the last bit of the text being studied. Thus, if the entire Mishna (all six "orders") is studied for someone's yahrzeit, the last mishna (individual ...
msh210's user avatar
  • 73.5k
9 votes
1 answer
2k views

Does one really have 30 days to put up a mezuza outside Eretz Israel?

It is broadly known and codified that one has 30 days to put up a mezuza when renting a home outside Eretz Israel. I heard that this dated from the times where Jews might be expelled in their first 30 ...
mbloch's user avatar
  • 53.1k
12 votes
3 answers
6k views

Wearing Watches on Shabbat

What is a watch one can wear on shabbat? There are the analogue quartz watches with just one crown to adjust the time that (as far as I'm aware) most people would wear on shabbat (especially an ...
930913's user avatar
  • 465
4 votes
3 answers
760 views

Precise Zemanim?

This site (see the paragraph starting with "accuracy") says that no one can predict the times for sunrise and sunset to within a minute accurately for a given location because of certain atmospheric ...
Double AA's user avatar
  • 99.9k
27 votes
12 answers
4k views

Why are women exempt from (many) time-bound mitzvot?

Women are generally exempt from time-bound mitzvot (Kiddushin 29a). I have heard two reasons for women being exempt from time-bound mitzvot and both seem problematic, so either there are additional ...
Monica Cellio's user avatar
16 votes
4 answers
10k views

When can you build the sukkah?

My wife and I love the holiday of Sukkot, as do many of our friends. We build the sukkah every year and have friends over for an evening meal, preferably on Shabbes - if someone else in our group of ...
Goodbye Stack Exchange's user avatar
16 votes
3 answers
693 views

How long can you say Asher Yotzar if you forgot?

If you forgot to say Asher Yotzar and remember a while later, is there a time limit as to when you are allowed to say it?
Gershon Gold's user avatar
13 votes
2 answers
1k views

Why only on the first Saturday night of Selichot is the minhag to start at midnight?

Pretty self explanatory. Some say at chatzot all week and some in the morning. Why davka on the first night does everyone say at night? This minhag does not seem apply on the second Saturday night (...
Double AA's user avatar
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11 votes
2 answers
670 views

Moshe Rabbeinu's knowledge of future events

If Moshe Rabbeinu was taught the entire Torah on Mt. Sinai (Rashi on Vayikra 25:1, Rambam), how do we explain events such as the incident involving the Bnos Tzelafchad (Bamidbar 27:1-11), or the tamei ...
Dave's user avatar
  • 21.1k
7 votes
4 answers
2k views

Eternal Gehinom

The talmud in Rosh Hashana 17a lists some sins which warrant eternal gehinom. Is this to be taken literally? Or perhaps it means a very long time or until the end of this world?
ray's user avatar
  • 21.3k
15 votes
3 answers
4k views

Brewing fresh coffee for Shabbos with a time clock

May one prepare coffee ingredients in a brewer such as this one on Friday and set the timer to brew the coffee for 8:00 Shabbos morning?
Gershon Gold's user avatar
15 votes
2 answers
327 views

How is the story of the Torah being given told in the Torah itself?

How was the Torah (aka the Five Books of Moses) given if the story of the Torah being given is contained in these books? In other words, the Torah tells the story - close to halfway through it - of ...
CodyBugstein's user avatar
  • 1,356
12 votes
1 answer
1k views

Where does the notion that the *entire* matza process must be done in under 18 minutes come from?

I've been going over the halakhoth for baking matzah, and even though I hear from almost every Rabbi I've asked that the entire process must be done in under 18 minutes, I can't find any evidence for ...
Aaron's user avatar
  • 11.2k
12 votes
1 answer
499 views

Rishonim saying Ester took place during the second bayis

Elsewhere on this site, avi cited sources to the effect that, contrary to the Bavli (M'gila), the events recounted in the book of Ester took place after the second bes hamikdash was built. Do any ...
msh210's user avatar
  • 73.5k
10 votes
2 answers
657 views

No mitzvah to wear tefillin every day?

I heard that the Bet HaLevi and the Peri Megadim hold that there is no Mitzva for a person to don Tefilin everyday. Can someone source these opinions and explain exactly what they are meaning to say?
Hacham Gabriel's user avatar
9 votes
2 answers
1k views

How do people daven so quickly, and what's the support for it?

I learned that one must clearly enunciate every word of tefila. At the least this would include Shemoneh Esreh and Shema, but one might presume it includes the entire prayer service. This question ...
yoel's user avatar
  • 7,301
9 votes
3 answers
1k views

Sleeping between meat and milk

I have heard in the name of the Chasam Sofer that if one sleeps after eating meat that they can be lenient in the amount of time one would normally wait between eating meat and milk. Is this written ...
Yehoshua's user avatar
  • 16.1k
7 votes
2 answers
4k views

Eating dairy after pareve on meat equipment?

If I eat hot pareve food that was made on meat equipment, is there a waiting period before I can eat dairy? I had always assumed so -- that the heat transfers the meatiness to the pareve food -- but ...
Monica Cellio's user avatar
6 votes
2 answers
3k views

Tashmish Ha-Mitah B'yom (Marital Relations by day.)

It says in Shulchan Aruch Siman 240 Sif 11 that it's prohibited to have marital relations by day unless the house is dark ("Bayis Afel".) The Rema adds that a Talmid Chacham that covers himself with ...
Yehoshua's user avatar
  • 16.1k
21 votes
3 answers
3k views

When did we start counting the Year since Creation?

This year is 5772 / תשעב (Taf-Shin-Ayin-Bet) on the Hebrew Calendar. What is the earliest reference to the Year counting from the Creation of the world?
David P. Hochman's user avatar
17 votes
3 answers
973 views

Eating out Friday night of Chanukkah

If one is lighting Chanukah candles inside (for whatever reason) relying on the publicizing to himself and his family, then what should he do on Friday night if he is eating out? Must he make the ...
Double AA's user avatar
  • 99.9k
11 votes
3 answers
741 views

Rav Moshe and Giving Your Time for Charity

I recall hearing that Rav Moshe Feinstein rules that one should donate a tenth of his time to learn with other Jews, in addition to the more commonly accepted 'tithe' of money. The only source I was ...
Salmononius2's user avatar
  • 6,803
11 votes
1 answer
1k views

Kiddush between 6 and 7 o'clock - Which clock?

Many people hold that one should not make kiddush on Shabbos between the hours of 6 and 7. (Sources: Shulchan Aruch Harav and Taamei Haminhagim, (who, in turn, bring a Maharil, a Magen Avraham, and a ...
HodofHod's user avatar
  • 21.1k
10 votes
5 answers
499 views

Waiting Between Meat & Dairy According To The Geonim

It seems as though the Geonim - although disparate and diverse in their opinions on many issues - seem to be rather united on the understanding of the Gemara on the subject of waiting after meat ...
user avatar
10 votes
2 answers
6k views

18 minute Matzah?

Are there sources EXPLAINING why we have to make matzah within 18 minutes? I understand having a time limit if in fact the reason we eat matzah is to reenact the speed which we left Egypt (that ...
morah hochman's user avatar
10 votes
1 answer
2k views

How did Jacob manage to have 12 children in 7 years?

Did Leah manage to have 6 sons and 1 daughter in the space of 7 years or was it over a longer period of time? In general it seems difficult to fit all of Ya'akov's children into a 7 year period. ...
Elie Steinbock's user avatar
9 votes
1 answer
855 views

What are the rules for ain mukdam umeuchar?

Sometimes we say that things in the Torah are not in chronological order. What are the parameters for this? do you need to have a mesorah (particular tradition) for this? Is there a list of all '...
upupdowndownleftrightleftright's user avatar
9 votes
2 answers
593 views

What are you supposed to do on Tisha baAv?

On Tisha baAv you can't eat wash oneself anoint oneself marital relation wearing leather shoes sit on a chair Torah study greeting people with a blessing conducting business going on a ...
user6781's user avatar
  • 3,333
7 votes
2 answers
526 views

Why are Pidyon HaBen ceremonies done towards evening?

Most Brissim are done in the morning, as it is mentioned that "Zerizim Makdimim L'Mitzvos". Why is this not applicable to a Pidyon Haben ceremony? If it is applicable, then why have I observed that ...
Gershon Gold's user avatar
7 votes
3 answers
148 views

Melachah on Shabbath - after Shabbath

If Melachah was done on Shabbath, can the product of that Melachah be enjoyed after Shabbath, and if so, under what criteria (does it depend on how long after Shabbath, or on the need, or something ...
Seth J's user avatar
  • 41.7k
6 votes
5 answers
6k views

What is the meaning of יוֹם (yowm) in Bereshit?

I've heard conflicting reports of how the creation days' יוֹם (yowm), in Bereshit are interpreted in the Jewish community. How do actual Hebrew scholars define day in Bereshit? Six 24 hour periods or ...
UserZer0's user avatar
  • 227
6 votes
7 answers
1k views

Rishonim/Achronim time period differentiation

When was the end of the Rishonim time period and the start of the achronim time period? Who, what, why, and how did this come about? What caused this abrupt change in deemed mental and halachot ...
user avatar
5 votes
3 answers
414 views

List of “essential prayers”?

If someone is learning how to pray and wants to start with the essentials - to not be overwhelmed by too much at once - or if someone is limited in time available to pray, what are the core (most ...
Sarah's user avatar
  • 121
4 votes
3 answers
1k views

how often do you have to check your mezuzot?

I heard it was twice in two years. Is that right? Where does that come from? If I have no reason to assume they became pasul do I still have to check them?
guywithmezuzas's user avatar
4 votes
1 answer
161 views

How much time must pass before making a second beracha on the same food?

If you made a beracha on a food or drink item and you took a sampling of it, how much time must pass until the next sampling for you to be required to make an additional beracha?
Ani Yodea's user avatar
  • 13.2k
15 votes
4 answers
480 views

When Tana"ch uses the phrase "until today" what does it mean?

There are numerous places where Tana"ch uses the phrase "עד היום" or "עד היום הזה" ("until\to this day"). Usually, this phrase is used regarding the names of cities, towns, etc. - occasionally, such ...
DanF's user avatar
  • 70.7k
13 votes
2 answers
1k views

Why 1,000 generations of ungiven Torah, not X years?

The Mainz Anonymous reads, in part (in my own translation): He created the Torah 974 generations before the world was created, then twenty-six generations [passed] from the creation of the world ...
msh210's user avatar
  • 73.5k
13 votes
3 answers
1k views

Is there a "5 second rule" for foods becoming non-Kosher?

OK so I don't actually mean a 5 second rule. But is there an amount of time that it takes for something hot that comes in contact with a non-Kosher utensil or surface to become not kosher? For ...
jim's user avatar
  • 878
12 votes
3 answers
691 views

Time dilation and waiting between meat and milk

Suppose Ploni eats some meat. He then gets in a spaceship and accelerates to some significant percentage of the speed of light for a short trip into outer space, and then returns home. At the time ...
Daniel's user avatar
  • 24.9k
12 votes
2 answers
2k views

Source for not eating Matzah prior to פסח?

Thanks to this question I am compelled to ask: What is the source for not eating Matzah prior to פסח? Is there a source for not eating it for 30 days prior?
Seth J's user avatar
  • 41.7k
11 votes
2 answers
195 views

Is there a halachic time limit for sending an organization its charity box money?

Many Jewish organizations distribute tzedaka (charity) boxes. A few that I know tell people, "collect the money and at some point, empty the money and mail us a check." Let's say someone leaves this ...
DanF's user avatar
  • 70.7k
9 votes
2 answers
198 views

Do traditional sources address how time “works”?

I’m sorry for such a convoluted question, but this has been bothering me for some time now. While the title isn’t quite accurate, I couldn’t think of a better way to phrase it - feel free to edit if ...
DonielF's user avatar
  • 34.4k
8 votes
1 answer
228 views

Call for Halachic Dateline Source(s)

OK, we've got some discussion going on about issues affecting life within the gray zone of the Halachic Dateline and the International Dateline, but what is the original source of such a concept, if ...
Seth J's user avatar
  • 41.7k
8 votes
3 answers
249 views

What took 8 days

What took the Jews 8 days to produce new oil when rededicating the Temple in the Chanuka story? It seems the process of oil-making takes a lot less time (I have done it in Israel on one of the tourist ...
SimchasTorah's user avatar
  • 33.3k
7 votes
2 answers
608 views

Why is the total count of Noah's life 950 years when the year of the flood took a full year cycle?

The Posuk says that Noah was 600 years when he went into the Teivah (Bereshit 7:6,11). Rashi (Bereshit 8:14) and the rest of the Mefarshim say that the flood took an entire year to complete. The Posuk ...
Yehuda's user avatar
  • 6,034
7 votes
1 answer
412 views

Drinking from a drinking fountain throughout the day

This question deals with someone who has a cup of a drink and carries it around all day long, possibly refilling it, etc. I am wondering, for someone who drinks from a drinking fountain every time he ...
Daniel's user avatar
  • 24.9k
6 votes
2 answers
1k views

Alarm clock handling on Shabbos

Are you allowed to touch an alarm clock on Shabbos?
SimchasTorah's user avatar
  • 33.3k