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18 votes

Halakhic International Date Line issues

You sure you want to open up this can of worms? :-) Here's the situation. There is no explicit mention of any such concept in the Torah, Talmud, or adressed by the Rambam, the Rosh, the Tur, or the ...
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13 votes
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Why don't Rabbinic fasts end by Ben Hashmashot?

The Talmud (Pesachim 54b) states that only for Tisha bAv must we be stringent for Bein Hashemashot. There is an opinion in Rishonim that only regarding the Bein Hashemashot at the beginning of the day ...
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11 votes
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Chanuka candles if missed the night

Shulchan Aruch O.C. 672:2 שכח או הדד ולא הדליק [....] ומיהו הני מילי לכתחילה; אבל אם עבר זה הזמן ולא הדליק, מדליק והולך כל הלילה. ואם עבר כל הלילה ולא הדליק, אין לו תשלומין If one forgot and didn't ...
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11 votes
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How does one handle ברכות התורה when learning through sunrise?

Shulchan Aruch Orach Chaim 47:13 rules that one who wakes up early to learn should make birchot hatorah before he starts learning, even if that is before the start of daylight. One does not repeat the ...
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10 votes
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Is the Fast of Tevet considered a 24 hour fast?

Only Yom Kippur and Tisha b'Av are 25-hour fasts. The others are minor fasts, from dawn (first light, before sunrise) until nightfall (full dark). The minor fasts are: Fast of Gedaliah (3 Tishrei) ...
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9 votes

Sh'kiya alarm app (iOS)

Ultimate Zmanim for iOS has that feature. With Zmanim Alarms, Ultimate Zmanim can remind you of important zmanim throughout the day. Shema, Tefila, and weekly candle lighting are all covered. (To ...
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8 votes
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In an average shul, how long before sunset does a combined weekday Mincha/Maariv service start?

The proprietors of goDaven were kind enough to supply me, for the purposes of answering this question, with their table of 5,960 mincha and/or maariv services. I used a Perl script to extract 1,046 ...
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8 votes
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The Effect of an 18- or 6-Hour Day

As long as we stay well (Stockholm is 7°/800 km/500 mi) south* of the polar circle, there will always be a sh'kia and a netz . Therefore, all zmanim can be calculated. Even a tzeis and an alos can be ...
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8 votes
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Flying During Channukah Candle Lighting

According to Rabbi Shlomo Fisher on ohr.edu, someone flying is exempt from lighting, because the rule is one candle per household ("נר איש וביתו;" Shabbos 21b); and if there's no one at home then ...
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8 votes
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Said Kiddush Levana prior to three days after Molad - Does he say it again?

The Be'er Hetev that you quote says that if Saturday night is before the third of the month, Kiddush Levana should be pushed off to the next Saturday night because it will still be before the 11th of ...
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8 votes

Can saying Sh'ma once satisfy two different Sh'ma obligations?

No it cannot. In fact, one cannot even recite shema twice in the period between alot hashachar and hanetz hachamah to count for the evening and morning readings. Shulchan Aruch Orach Chaim 58:5: ...
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7 votes

Choosing between Brachos on Shma and Sof Zman Kriyas Shema

He should say Shema absolutely immediately as the printed time may not be completely exact. (See ShA OC 46:9 with commentaries. The assumption there is that one who can't say the blessings of Shema ...
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7 votes

Is there any evidence of time-zones in Talmud? (Tanaim and Amoraim only)

In Talmud Bavli Rosh Hashanna 20b, R' Zeira quotes R' Nachman as saying: כ"ד שעי מכסי סיהרא לדידן שית מעתיקא ותמני סרי מחדתא לדידהו שית מחדתא ותמני סרי מעתיקא For 24 hours, the [moon] light ...
7 votes

Halachic Justifications for the Amshinover Rebbe

Regarding Havdalah during the week, I believe the reason why you find the Rebbe doing is so is because he actually keeps Shabbas until Tuesday. I heard this from a well-known story that the Gedolim ...
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7 votes
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Time for morning prayer when flying over Greenland and seeing the sun rise twice

From http://ravbaruch.com/AskTheRabbi.asp?QID=92#_ftn2: Reportedly, Rav S. Z. Auerbach z’’l and Rav Moshe Feinstein z’’l ruled that if one experiences two sunrises on the same day of the week, one ...
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7 votes

How many ‘Watches’ were there in an ancient Hebrew day?

Tractate Brachos of Talmud of Babylon 3b says this is a dispute between 2 tanaim (Rabbis in the period of the Mishna just under 2 millenia ago) whether there are 3 or 4 watches in the night: תנו ...
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6 votes

When is the latest time you can daven minchah bedieved?

From: http://www.torah.org/advanced/weekly-halacha/5757/chaysara.html One should be extremely careful to finish davening Mincha by Shkiah, sunset, since many early Poskim (12) hold that it is ...
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6 votes
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If kings get up at 3 hours past sunrise, wouldn't they need some extra time to say Shma?

NOTE: both of these are only partial answers; the 1st may be against the Rashba and the 2nd is disputed First Answer The simplest answer might be that the times of getting up and going to sleep are ...
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6 votes
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Timing of Maariv / Havdalah at the end of Shabbos

If you really need to, you can say Maariv and Havdalah (omitting the blessing on the candle) from Plag HaMincha (1.25 hours before sunset) (ShA OC 293:3) just as much as you can say Maariv and Kiddush ...
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6 votes
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12 halachic hours – why no more halachic consequences?

The argument does indeed apply across the board. Perhaps you see it discussed most about the last time for reciting Shema since that's the only time during the day with potential biblical ...
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6 votes
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Why is the wait between meat and milk not halachically calculated?

Interestingly the Pitchei Tshuva on SA YD 89:1, in the context of eating meat after milk, brings an opinion from Beer Heitev shel Maharit that these could be shaot zemaniot. He quickly writes the Pri ...
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6 votes
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What time of day was the afternoon korban mincha offered in the beit hamikdash, according to hazal?

What is called the time of mincha is actually the time of the afternoon tamid (for explanations of the name, see Tosafot Pesachim 107a). The afternoon tamid was generally slaughtered at eight and a ...
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5 votes

Earliest time to make an Eiruv Tavshilin

See the Kitzur Yalkut Yosef in סימן תקכז - הלכות עירובי תבשילין that one should do it during the 24 hours of Erev Yom Tov. If one does it earlier, one should redo it - but without a Bracha. However ...
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5 votes
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Why is the mitzvah of tefellin not by night?

Shulchan Oruch Orach Chayyim 30 (2) MB [3, 4] forbids wearing Tefillin at nighttime. MB explains that this is a Rabbinic prohibition in case he would fall asleep wearing them and emit wind from below. ...
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5 votes

Why are mincha gedola and ketana named that?

Mincha Gedola is three hours long thus it is the big Mincha. Mincha Ketana is 2 1/2 hours long thus it is the small Mincha. Regarding Plag Hamincha it is the time in between Mincha Ketana and Shekiya, ...
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5 votes

Can not obeying a Gentile's opinion of Shabbat time cause a Chilul Hashem?

You can avoid any concerns about chillul Hashem by intercepting and correcting the negative impression your gentile coworker has of you. The problem here is an education gap, which you can fix. Your ...
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5 votes
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Alarm clock in place of a shomer

R' Sh'lomo Zalman Auerbach indicated that it would be acceptable to rely upon an alarm for eating if the alarm is functional, although it should not be relied upon to wake oneself from sleep (Halichos ...
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5 votes

What time should Chanuka candles be lit in the Southern Hemisphere?

A blog in The Times of Israel makes it clear that the normal time of lighting (“as soon as possible after nightfall”) is observed in Melbourne Australia: For starters, it only gets dark well after ...
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5 votes

Yahrtzeit Bein HaShemashos

Nitei Gavriel Aveilus 2 - 77:1 says that there are those that say it is best to hold the Yahrzheit the earlier day, those that say it is best to hold the Yahrzheit the later day, and those that say to ...
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5 votes

Can saying Sh'ma once satisfy two different Sh'ma obligations?

The Aruch Hashulchan in 58:8 quotes the Bet Yosef (Seif 8) that if you read Sh'ma after dawn to fulfill your nighttime obligation, you may not read it again until after sunrise to fulfill your daytime ...
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