Questions related to different times of day as they apply to Jewish Law.

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17
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6answers
1k views

Halakhic International Date Line issues

According to halakha, where is the international date line? More specifically, I have heard that some people say you should observe Shabbat on Sunday in Japan & New Zealand and/or on Friday in ...
14
votes
3answers
954 views

When does somebody living in space (e.g. ISS) observe Shabbat?

I understand that Jewish astronauts have been advised to observe Shabbat by Cape Canaveral time, by analogy with traveling to a place that doesn't have daily sunrise/sunset where some rule you use the ...
12
votes
1answer
367 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?
5
votes
2answers
311 views

Time for t'filah and you don't have a siddur: better to daven from memory or wait (and possibly miss the time)?

If the set time comes to daven (on a weekday, let's say) and you unexpectedly don't have a suitable (or any) siddur,1 does halacha call for you to wait (and possibly miss that amidah entirely), or ...
6
votes
1answer
394 views

Shabbat in the arctic

If I were to travel to Barrow, Alaska in the summer, when there is no sunset, when should I light the Shabbat candles? (This is not a hypothetical question; I work remotely for an Alaskan corporation ...
14
votes
4answers
484 views

Commencing Shabbos: Shkiya behind a mountain

It is common practice nowadays for Shuls to publish the zmanim (times) to begin Shabbos (the Sabbath) and other activities. These times, it would seem, are based upon standard calculations of sunrise ...
2
votes
3answers
322 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 ...
14
votes
3answers
4k views

Putting on tefillin late

For whatever reason, I was unable to put on tefillin while davening shacharit this morning. However, I have access to tefillin now, and the sun has not yet set. After I put on the tefillin, what ...
10
votes
1answer
890 views

Halachic justification to not pray the amidah before zman t'filah?

Some Chassidic courts are not makpid (careful) to daven the morning Amidah before z'man tefilah, although this seems to be a clear halacha. Are there any opinions they are relying on? I was once told ...
8
votes
1answer
3k views

When is the earliest time you can daven ma'ariv during the week?

When is the earliest time you can Daven Maariv on a weekday?
4
votes
2answers
229 views

Shachris in the Dark

When do people who live in places where it is dark for days Daven Shachris and put on Tefillin? Please provide a source (Mareh Makom).
17
votes
4answers
3k views

Fast days and time zones

If I fly westward on a fast day, and travel through one/several time zone/s, thereby going back in (clock) time, must I then fast until it ends in my current time zone? What if I fly eastward, thereby ...
8
votes
1answer
224 views

When do Sefardim start mourning in a year that Tisha B'av is postponed until Sunday?

As mentioned here, Sefardim observe the mourning period known to Ashkenazim as "The Nine Days" only during the week that Tisha B'av occurs. Tisha B'av falls out on Shabbat this year (5772), and the ...
9
votes
6answers
4k views

When is the latest time you can daven minchah bedieved?

If you realized that you didn't yet daven minchah and it's past shekiyah, when is the latest that you can begin praying the Amidah? I'm looking for different people's cutoffs.
10
votes
3answers
531 views

Eating before davening Shacharis

Are there any accepted authorities of Halacha that permit a man to eat (i.e., "real" eating such as consuming cake or cereal) before davening Shacharis under "normal circumstances" (i.e., a healthy ...
9
votes
2answers
3k views

Davening on Plane Zmanim

How do you know when to daven Shachris on a plane?
5
votes
3answers
489 views

If it's your minhag to daven Hanetz, do you do so even without a minyan?

A friend once told me that if one's minhag is to daven with Hanetz (i.e., starting the Amida prayer at sunrise), and if there's no Hanetz minyan nearby, you should still daven Hanetz, even without a ...
5
votes
3answers
168 views

Flying During Channukah Candle Lighting

Obviously you cannot light candles on a plane, so if you can't light candles within the time frame is there any other activity one could do, which is permissible on an airline, that would fulfill the ...
11
votes
1answer
645 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 ...
10
votes
3answers
7k views

What is the earliest time one can daven Shacharis?

When is the earliest time you can Daven Shacharis?
7
votes
1answer
147 views

Candle Lighting Time: Why Then?

Why 18 minutes (or other minhagim). Where did these numbers come from?
6
votes
2answers
712 views

Can one follow Rabbeinu Tam time for beginning Shabbos?

Does anyone today follow Rabbineu Tam time for the beginning of Shabbos? Reading some tshuvas (e.g. Eretz haTzvi) it is clear this was widespread in Europe. If one has previously been accustomed to ...
3
votes
1answer
299 views

eating before kiddush

Is there any time in the early morning on Shabbat in which I can eat and drink something without any question of it being considered eating before davening and kiddush? For example, at 3, 4, or 5 o'...
13
votes
1answer
348 views

Why don't Rabbinic fasts end by Ben Hashmashot?

There's a doubt in the Gemara when the new day starts, at sunset or at three stars (Ok, and there's Rabbi Yossi's opinion). When it comes to Shabbos (or any other biblical time), we have to be strict ...
11
votes
2answers
389 views

Latest shabbat not longest day…?

I was under the impression that the longest day was June 22nd, and yet, year after year- the latest time for candle lighting takes place about a week and a half after that. Intuitively, the latest ...
6
votes
1answer
360 views

Can I say kiddush levana during daylight hours if the moon is visible?

Suppose it's late afternoon or early morning and the moon is visible -- can I say it then? Or must it be at "night"? (If so, how do we define "night"?)
5
votes
0answers
25 views

Time for evening prayer when flying eastward over Greenland and the sun doesn’t set?

(This is the “return" question for my question on the right time for shaharis when encountering sunrise twice in a day) In the summer, when flying from the East Coast to Tel Aviv on an afternoon ...
4
votes
1answer
456 views

If you didn’t put on tefilin at shacharis, when should you? [duplicate]

Possible Duplicate: Putting on tefillin late Someone was unable to put on tefilin when he 'davened' (prayed) shacharis. When should he put on tefilin — immediately when he has the ...
4
votes
3answers
82 views

12 hours to the day, 12 hours to the night

Why is a day and night divided into 12 hours? Why not 10 hours? What is the significance of 12?
3
votes
1answer
310 views

Eating before shachris when up all night

This question has been asked (and answered) on this forum before, but my question is when is the cutoff after which it is considered eating before shachris (as opposed to eating AFTER maariv). ...
3
votes
5answers
2k views

Priorities: Mincha Ketana vs Mincha Gedola

Which timing of mincha is more important: mincha gedolah or mincha ketana? Why?
3
votes
1answer
264 views

Variant on: Is it better to Daven “too early” with a Minyan, or to Daven alone at the right time?

In many communities there is a regular weekday morning Minyan and the "working-person's" Minyan, which technically Davens too early according to most opinions, but which is better than nothing, ...
3
votes
1answer
294 views

Mincha started before sheki'a, extended beyond it. What about davenning maariv straight after mincha?

A minyan starts to daven mincha before sheki’a with the intention to daven maariv after sheki’a. In the event, mincha extends beyond shki’a. There are IMHO three possible cases: They start but do ...
2
votes
1answer
87 views

Biblical vs. Rabbinical end of Shabbat

This question states, "havdalah ends shabbat (for one who didn't daven ma'ariv)." But won't Shabbat end on its own at some point--specifically, at nightfall--even if we don't make havdalah nor daven ...
1
vote
1answer
250 views

time for shacharit and eating before this time

When is the obligation for Shacharit? Is this what is considered the morning? Is it dawn (alot hashachar), or the earliest time for tallit and tefillin, or sunrise (netz), or the latest time for ...
4
votes
1answer
381 views

Jewish Sunrise and Sunset

How can one calculate Jewish sunrise and sunset? I'm not necessarily asking for a formula. Just wondering if there's a difference between Halachik rise/set and what the world considers [e.g. science] ...
14
votes
1answer
495 views

Time for morning prayer when flying over Greenland and seeing the sun rise twice

Last year I flew from Tel Aviv to Los Angeles. The flight leaves at night (1am) and, in the winter, lands when it is still night (630am). However during the flight, over Greenland, one sees the sun ...
13
votes
2answers
1k views

40 minutes offset for candle lighting?

Several Zmanim apps are giving a choice on my "candle lighting offset". The default here is 40 minutes instead of the usual 18 minutes I've heard. Why 40? Why do I even have a choice? Does the fact ...
8
votes
1answer
669 views

When praying alone, can one say Ma'ariv/Arvit before shkia (sunset)?

I have heard in the past that one praying alone may not say Ma'ariv/Arvit until shkia/sunset but that one praying with a minyan can start Ma'ariv as early as Plag HaMincha. Could someone provide me a ...
7
votes
1answer
214 views

A Jew is born in space. What time rules does he follow?

I know that the title sounds like a sequel to a TV show (Lost in space). But based on a statement in this article : The Rabbis therefore rule that a person should continue to follow the time ...
2
votes
2answers
55 views

If צאת is late, then פלג is late. When does one light the מנורה on Friday?

One cannot light the Chanuka lights before p'lag hamincha (Shulchan Aruch 672:1), not even on Friday evening (Mishna B'rura 679:2). If he did so, his lighting is invalid (Shaar Hatziyun 672:4). P'lag ...
2
votes
1answer
232 views

Making up a synagogue calendar manually is tedious work. Which software can do the calculations automatically?

Lots of synagogues print up a customized calendar every year. (Sample.) Such a calendar includes shul-specific information (e.g. service times and maybe a weekly class or two) and general information (...
13
votes
2answers
496 views

Polyphasic Sleep and Halacha

I recently read an article on polyphasic sleep and I'm quite interested in experimenting with it. The article advises the Uberman approach which advocates 20-30 minute naps every four hours, meaning ...
11
votes
3answers
270 views

Who distributed the zemiros across the three meals?

Any book of zemiros whether it's a siddur, birchon, or what have you divides the zemiros between the three meals. Sometimes the rationale is obvious as with the tikkunim which are written for each ...
11
votes
1answer
253 views

Is all-night Shavu'ot learning as prevelant in the Southern Hemisphere?

In the Northern Hemisphere, Shavu'ot falls in the late Spring or early Summer. As a result, sunrise is relatively early, so learning "all night" and then praying the morning service at the earliest ...
9
votes
1answer
202 views

Said Kiddush Levana prior to three days after Molad - Does he say it again?

Be'er Hataiv 426:10 says that one can say Kiddush Levana as early as 3 days after the Molad. The Rambam - Hilchos Brachos 10:17 rules that one may say Kiddush Levana immediately after the Molad. ...
8
votes
2answers
2k views

Until what time in the morning may you eat on a fast day?

On fast days that begin in the morning, (Asara B'Teves, Taanis Esther, Shiva Asar B'Tamuz, Tzom Gedalya) if you intend to eat when you awake, until what time may you eat in the morning? Does it depend ...
8
votes
2answers
171 views

Determining times of Halachic import on a long flight

If I'm taking a long flight on an airplane on a day when permitted activities change at a certain point, e.g. with the start or end of a fast day, or with the start of the chametz prohibition kicking ...
8
votes
2answers
833 views

Magen Avraham - Practically no Plag HaMinḥah or just no Plag HaMinḥah in winter?

Calling all science and math-oriented Judaism.SE-ers! According to the website MyZmanim.com, today's Halachic times where I work are as follows (only a handful of times are shown because the question ...
7
votes
1answer
588 views

When do the restrictions of 3 weeks start when 17 Tammuz is on Shabbos?

When do the restrictions of 3 weeks start when 17 Tammuz is on Shabbos (e.g. this year)? Do they start motzei shabbos (already 18 Tammuz), since the 17 Tammuz is technically on shabbos or do they ...