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4
votes
2answers
119 views

Shabbat with time dilation in space

I know there is some discussion in space/planets.. How would you keep shabbos in space? The Rabbi I asked this shabbat pretty much said the same thing; and you go by Jerusalem time when in doubt. ...
4
votes
1answer
88 views

How were long-running talmudic discussions actually conducted?

Eiruvin 13b records two years-long disputes between Beit Hillel and Beit Shammai, and surely these are not the only long-running debates. How did that work in practice? Did they really have a single ...
4
votes
2answers
127 views

Why does Hashem sometimes wait until the very last minute?

I have noticed in my own life and in that of others, that very often during a time of tzarah, Hashem waits until the very very last moment to send a Yeshua. Are there any sources that discuss the ...
4
votes
1answer
122 views

How long does it take to become a kofer?

If a person for whatever reason momentarily has a thought which denies God, but then afterwards reaffirms his belief in Hashem, is that an act of kefira? Does a momentary lapse in belief constitute a ...
4
votes
1answer
65 views

Must one publicize a lost object if it had been found a long time prior?

Let's say, for whatever reason, someone found a lost object but did not get around to publicizing it for over a year. Does the Mitzvah to publicize it still apply, assuming that after the long ...
4
votes
1answer
371 views

Why did God take 7 days to create the world?

Generally we assume that God is omnipotent, and could have created the world in a single day\act, so He must have had a reason to organize creation into 7 days. Why? In other words: Why didn't God ...
4
votes
0answers
52 views

How long can יוצא ונכנס be?

In regards to kosher supervision, what is the largest single gap that a mashgiach can leave the premise and still be considered practicing יוצא ונכנס?
4
votes
0answers
42 views

Davar Ha'avad on Chol HaMoed — Loss coming later

It says in SA OC Siman 537 that one is allowed to do a malacha on chol hamoed if it's a "davar ha'aved". That is to say if the person doesn't do the malacha now it will come to a loss ("hefsed".) ...
4
votes
0answers
149 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 ...
4
votes
0answers
70 views

Connection of Toch Kedei Dibbur to Walking 4 Amot

According to this, the gemara compares Toch Kedei Dibbur (the length of time neccasary to greet someone; see Shalom alecha rebbi (u'mori) ) to the time it takes to walk 4 amot (cubits). Thus, with ...
3
votes
3answers
284 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?
3
votes
2answers
1k views

How long is the required suspension of marital intimacy after childbirth?

How many days a must married couple refrain from intimacy after their baby is born?
3
votes
2answers
108 views

Daf Yomi Scheduling for Shabbos, Yom Tov, and Sundays

With the twelfth Siyum HaShas behind us, I was wondering what is the best way for a person to maintain their Daf Yomi schedule on Shabbos, Yom Tov, and Sundays. Is it best to learn at a different time ...
3
votes
3answers
126 views

Does a Late Bris Necessitate Teffilin?

When one makes a Bris after Shacharis, he wears Tefilin. If a Bris is made later on in the day, does he wear Tefilin? Why or why not? And if he does, does it require a second Bracha?
3
votes
1answer
501 views

Self-winding wristwatches on Shabbos

Can self-winding wristwatches be used on Shabbos?
3
votes
1answer
88 views

Logistics of starting Shabbat early?

It is not uncommon to start Shabbat early in the summertime, I presume so that dinner will not start too late. What I have seen is that in congregations that do this, the men go to shul Friday night ...
3
votes
2answers
123 views

Shalom alecha rebbi (u'mori)

What is the significance of the time it takes to say Shalom Alecha Rebbi (U'mori)?
3
votes
2answers
55 views

(When) should skipped parts of davening be made up?

If someone skips parts of shacharit in order to say shemoneh esrei with the congregation, (when) should the skipped paragraphs be made up?
3
votes
1answer
58 views

Why does age of a water filter affect how to kasher it?

The Star-K Web site says about water filters: If they are metal and have been on [the faucet] consistently since the previous Pesach, they should be left on during kashering of the spigot [for ...
3
votes
1answer
160 views

How can you keep Shabbos till Tuesday?

I have heard that there are people who keep Shabbos till Tuesday. I would like to understand how that works practically. A few examples of puzzling situations: What shmoneh esrei does such a person ...
3
votes
1answer
71 views

Pesik Resheih DeLa'Avar (inevitable consequence relating to the past)

The RaM"a (Y"D 87:6) cites an opinion that one may shouldn't stoke a flame beneath a non-Jew's pot, for fear that there's some milk and meat residue in it, and you might come to cook said milk and ...
3
votes
1answer
52 views

How long is לאלתר?

In the mishna on Gitin 27a, the rule is that if someone delivers a get (bill of divorce) from another country, loses it, and finds it again, should not deliver it to the woman unless he either finds ...
3
votes
2answers
135 views

Starting Mincha right before Shekiya

According to those who pray Mincha only up to Shekiya (sunset), are you required to finish Mincha before Shekiya or just required to begin it before Shekiya? (Sources.)
3
votes
1answer
80 views

Why do I care what time Bnei Melachim (sons of kings) rise in the morning?

The Mishnah in Berachothch2? teaches that one may recite Shema' until the end of the third hour of the day, "for it is the way of the sons of kings to rise by three hours." Why is that the deciding ...
3
votes
0answers
41 views

Morning seder as the “main” seder

In most Yeshivas with which I am familiar, morning seder, the regimen of learning before lunch, is the more in-depth and intense learning seder, while afternoon seder (session) is generally less ...
3
votes
0answers
48 views

Where and when did the numerical time units (hours) originate? [duplicate]

The Torah states no numerical divisions for the day. The closest numeric we find is that there are 7 days in the week, and that the start of the "day" begins with "erev" (and there are debates on when ...
3
votes
0answers
51 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?
3
votes
0answers
48 views

Inconsistent scheduling for the musaf offering

In P'sachim (58a), Abaye frames a disagreement between Rabbi Yishma'el and Rabbi Akiva regarding the ordering of the korban musaf and the bazichin (bowls of frankincense burned when the old showbread ...
3
votes
0answers
49 views

“Yichud L'Olam” in Hilchos Muktzeh

In Hilchos Muktzeh we find there is an idea that even a rock ("evan") one can be m'yached (set aside) for a certain purpose allowing one to move it around on Shabbos (See SA OC Siman 308 Sif 22.) ...
3
votes
3answers
228 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 ...
2
votes
2answers
139 views

Can Jews standing naval watches take their shabbat in shifts?

Suppose you have an major naval ship (aircraft carrier or nuclear sub) with a small complement of Jews on board. They're divided by the executive officer to stand watches, same as the rest of the ...
2
votes
3answers
164 views

Is Hashem in time? [closed]

Is Hashem in time?
2
votes
2answers
100 views

How is it possible that Yisrael went out of Egypt after only 210 years due to hard work?

Is it possible to say that the Jews were in Egypt for only 210 years because they were worked so hard? Would Hashem really do that if he already told Avraham that they would be there for 400 years?
2
votes
1answer
114 views

Are there prophetic perfect tenses?

In Christianity, there is a school of interpretation where God sometimes describe future events using past tenses. God, being outside of time, see future events as if it already happens and hence use ...
2
votes
1answer
215 views

Sitting on a toilet during Tisha B'Av

May one sit on a toilet during Tisha B'Av? Are there any requirements that he hurry up as much as possible?
2
votes
2answers
67 views

Can the time a dream occurs influence its significance?

Does the time during the day or night when one has a dream have any influence on how meaningful it is? I've heard it does, but have no good source, and wonder whether it's true.
2
votes
2answers
666 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 ...
2
votes
1answer
58 views

How long did the showdown with Paro last?

Recently my torah-study group was discussing the events of Parshat Sh'mot, and someone claimed that people could only gather straw for bricks in the fall (I don't know if that's true) and the exodus ...
2
votes
1answer
108 views

Mesilat Yesharim - how much time per day for zehirut/watchfulness

The Mesilat Yesharim brings down zehirut (watchfulness) as one of the first steps to master. Zehirut in essence means working on cleaning oneself up from all bad behavior through analyzing one's ...
2
votes
2answers
157 views

Mishkan before/after Egel (Rashi & Ramban)

The Ramban and Rashi disagree when the Mishkan was commanded to be built. Either before or after the Egel HaZahav respectively. Can you provide SOURCES that are able to reconcile their differences? ...
2
votes
3answers
228 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 ...
2
votes
1answer
93 views

“If you have time, say this”

I have seen in many siddurim, mainly in korbonos, the phrase "if you have time, add this parsha". How do you know if you have time? It seems obvious that if adding it would make you miss zman ...
2
votes
1answer
90 views

If you've missed Zeman Kriyas Shema, what should you do?

Suppose a fellow realizes at 9:16AM that the Gra Zeman Kriyas Shema was at 9:14 and he never said Kriyas Shema yet. Is there any gain by saying it immediately even though it is past the later Zeman ...
2
votes
1answer
115 views

When is a grafted tree Kosher?

I understand that fruit isn't kosher if it is picked in the first 3 years of growth. However, what about grafting trees? If two branches come from trees that each more that 3 years old, but the ...
2
votes
1answer
226 views

Breakdown of Yirmiyahu's 70 year prophecy

Can someone supply a good breakdown of Yirmiyahu's 70 year prophecy, and the misinterpretations of the prophecy? This is what I've learned in the past: Yirmiyahu made a prophecy that 70 years after ...
2
votes
1answer
31 views

How long was Shimon in prison?

In Bereishit 42:24 Shimon is taken away from the brothers and put in prison as surety so that the other brothers will bring back Binyamin to prove that they are not spies. The brothers then return to ...
2
votes
1answer
48 views

Is there a Jewish tradition according to which each creative day was 7000 years?

I remember hearing (long ago, so it could be that I remember wrong) that, according to a Jewish tradition, the last day of creation (Gods day or rest) is 7000 years long and that consequently the ...
2
votes
1answer
34 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 ...
2
votes
1answer
40 views

Baal T'acher today - based on Rosh Hashana 4

Rosh Hashana 4a & Rosh Hashana 4b mentions a whole list of items that one does the sin of Baal T'acher. There is a dispute as to when this prohibition takes effect, ranging from the first festival ...
2
votes
1answer
103 views

Seeing dam due to relations and the halachos of vests

If a woman was a "ro'eh machmis tashmish" (she saw blood after having relations), does the day that it happened go into the account of her "vestes" (the days that she will have to be concerned she may ...