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

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15
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6answers
700 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
4answers
2k 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 ...
14
votes
3answers
3k 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 ...
13
votes
4answers
345 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 ...
13
votes
1answer
266 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 ...
12
votes
7answers
224 views

Zmanim accuracy before digital clocks?

How was time measured for the purpose of Zmanim before we had accurate clocks like we do today? Was it possible to accurately determine Chatzos (at night) or the different watches of the night? I know ...
12
votes
2answers
755 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 ...
12
votes
1answer
86 views

If kings get up at 3 hours past sunrise, wouldn't they need some extra time to say Shma?

Mishna Brachot 1:2 gives the times for saying Shma in the morning. מאימתיי קורין את שמע בשחרים: משיכיר בין תכלת ללבן; רבי אליעזר אומר, בין תכלת לכרתן. עד הנץ החמה; רבי יהושוע אומר, עד שלוש שעות, ...
11
votes
3answers
720 views

Are there required “ritual/daily” prayers in Judaism?

I have a question about the daily prayers of Judaism. I noticed on my trip to Jerusalem that a lot of those practicing Judaism got up at a certain time in the morning on the plane and faced a wall and ...
11
votes
3answers
559 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 ...
11
votes
1answer
497 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 ...
11
votes
1answer
220 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 ...
11
votes
3answers
236 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 ...
10
votes
2answers
322 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 ...
10
votes
1answer
302 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?
10
votes
1answer
127 views

The Effect of an 18- or 6-Hour Day

Since the 18th century, Jews have been settling in Sweden without the requirement of conversion (source). As such, there are now a number of Swedish Jewish communities, the largest of which is in ...
9
votes
1answer
568 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 ...
9
votes
2answers
237 views

Davening early Maariv first night of Shavuos

I have always heard that on the first night of Shavuos you should wait till Tzais HaKochavim for Maariv in order to have Temimos - 7 complete weeks of Sefira. Recently I heard that Harav Ovadia Yosef ...
9
votes
2answers
371 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 ...
8
votes
3answers
253 views

Earliest time to make an Eiruv Tavshilin

When's the earliest time one can make an Eiruv Tavshilin on erev yom tov?
8
votes
2answers
516 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 ...
8
votes
3answers
302 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 ...
8
votes
1answer
2k views

Davening on Plane Zmanim

How do you know when to daven Shachris on a plane?
8
votes
3answers
298 views

Hours, minutes, and chalakim

On Shabbat preceding Rosh Chodesh, the time of the molad is generally announced in units of hours, minutes, and chalakim. However, minutes are not a traditional Jewish unit of time; rather hours are ...
8
votes
1answer
477 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
3answers
5k views

What is the earliest time one can daven Shacharis?

When is the earliest time you can Daven Shacharis?
7
votes
2answers
580 views

Davening late rather than never?

If for some reason I am held up doing something until after the time that mincha must be done by and I have not davened mincha, is it better to daven mincha after the time it is supposed to be done by ...
7
votes
1answer
116 views

Candle Lighting Time: Why Then?

Why 18 minutes (or other minhagim). Where did these numbers come from?
7
votes
1answer
279 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 ...
7
votes
1answer
570 views

Davening after the zman

Can someone please explain the halachot for someone who wakes up after zman kriat shema? After zman tfillah?
7
votes
2answers
977 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 ...
7
votes
1answer
155 views

What can I skip after Amida in Shacharit?

I have very little time for shacharit, because I have to go to work. The minyan in the city where I live is very late. So I try to daven everything before the Amida and the Amida itself with a Tzibur, ...
7
votes
1answer
155 views

Does praying at the wrong time count for anything?

(This question might be a prerequisite to be able to answer this question.) Does praying at the wrong time count for anything? What does it accomplish? Sources, please.
6
votes
1answer
164 views

Why does it get darker in Israel quicker?

Why is it that it gets darker in Eretz Yisroel quicker than in the USA, making for a shorter Ben Hash'moshos?
6
votes
1answer
249 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"?)
6
votes
1answer
131 views

Chanuka lighting: BeZman (at the best time) or Pirsumei Nissa (publicization of the miracle)?

Is it better to light candles at bezman, or later when there will be more pirsumei nissa? I find 4:30 (approx candlelighting time in NYC this year) to be too early to catch the regular "rush hour." Is ...
6
votes
2answers
196 views

Tachanun for Shacharis in the afternoon, on a day where there is no Tachanun at Mincha

If you start Shacharis Shmonei Esrei just before Chatzos, on a day where there is no Tachanun said at Mincha, and finished after Chatzos, do you say Tachanun?
6
votes
3answers
173 views

Why does Jewish law and tradition specify times for saying Shema?

This question is asked at a very basic level, not deeply aware of Judaism or the process of Jewish law. I'm not Jewish so it isn't directly applicable to me, but it helps me to ask a broader question ...
6
votes
0answers
50 views

Shkiya/Netz behind a mountain [duplicate]

Possible Duplicate: Commencing Shabbos If one is located behind a mountain, what time is Shkiya or Tzeis? Is it when the sun sets below the "calculated" horizon (when the sun should set ...
5
votes
2answers
97 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 ...
5
votes
3answers
339 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
5answers
1k 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.
5
votes
1answer
121 views

What is “חצות האמצעי”?

While researching an answer to this question I stumbled across the term "חצות האמצעי". What does it mean? Does it refer to halachic midday, i.e. halfway between netz hachama and shkias hachama, or ...
5
votes
2answers
69 views

When can Melavah Malkah be eaten until?

When is the last time one can eat a meal on Motzei Shabbos and still have it considered Melavah Malkah? When is the deadline?
5
votes
2answers
210 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 ...
5
votes
3answers
217 views

In an average shul, how long before sunset does a combined weekday Mincha/Maariv service start?

Many shuls worldwide run combined weekday Mincha/Maariv services. How long before sunset do these services tend to start? Please specify a range, measured in "number of minutes". Also, please cite ...
5
votes
2answers
740 views

How is Chatzos Halayla (Halachic Midnight) calculated?

It seems pretty easy to calculate from the get-go that the formula is something like this: # a halachic hour is one twelfth of the time between sunrise and sunset halachicHour = (timeOfSunset - ...
5
votes
1answer
279 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 ...
5
votes
2answers
206 views

Bathroom or shema if you only have time for one?

If you wake up 5 minutes before sof zman kryat shema and you have to use the bathroom. Going to the bathroom when necessary is deorayasa (Shulchan Aruch 3:17) and so is saying the shema. Also there ...
5
votes
1answer
113 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 ...