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Kriyat Shema: Difference between revisions

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* There are three approaches in the Rishonim how we hold. Rambam (Keriyat Shema 1:11-12) holds like Abaye that one can say it shortly before HaNetz and in Shat HaDachak one can say it from Olot Hashachar. The Bet Yosef 58, Bach 58, and Pri Chadash 58:1 hold that the Rif agrees with the Rambam.  
* There are three approaches in the Rishonim how we hold. Rambam (Keriyat Shema 1:11-12) holds like Abaye that one can say it shortly before HaNetz and in Shat HaDachak one can say it from Olot Hashachar. The Bet Yosef 58, Bach 58, and Pri Chadash 58:1 hold that the Rif agrees with the Rambam.  
* Rosh (Brachot 1:10), Talmedei Rabbenu Yonah 4b, and Rashba 9b hold that Lechatchila one can say it at Olot but it’s preferable to wait until shortly before HaNetz. So agree majority of the Goenim and Rishonim including Siddur Rav Amram Goan 15 pg 90, Siddur Rashi 8-9, Sefer Chinuch 420, Tosfot Yoma 37b s.v. Abaye, Ramban (Milchamot beginning of Brachot), Or Zaruh (Kriyat Shema 1:13), Meiri (Brachot 9b), Nemukei Yosef (Brachot 9b), Rashbetz (Brachot 9b), Ritva (Brachot 9b, Yoma 37b), and Tur 58.  
* Rosh (Brachot 1:10), Talmedei Rabbenu Yonah 4b, and Rashba 9b hold that Lechatchila one can say it at Olot but it’s preferable to wait until shortly before HaNetz. So agree majority of the Goenim and Rishonim including Siddur Rav Amram Goan 15 pg 90, Siddur Rashi 8-9, Sefer Chinuch 420, Tosfot Yoma 37b s.v. Abaye, Ramban (Milchamot beginning of Brachot), Or Zaruh (Kriyat Shema 1:13), Meiri (Brachot 9b), Nemukei Yosef (Brachot 9b), Rashbetz (Brachot 9b), Ritva (Brachot 9b, Yoma 37b), and Tur 58.  
* Rabbenu Chananel (Brachot 9b) holds one should say Vatakin by saying Shema specifically at HaNetz and not shortly before. So holds Bal Hamoar (Beginning of Brachot), Roke’ach 3320 pg 211, and Avudraham (Shacharit Chol 1) who says Rabbenu Hai Goan would say the brachot before HaNetz and Shema only at HaNetz, and Rabbenu Tam (Sefer Yashar Sh”t 8:1) holds like Rabbenu Chananel but for a different reason.  
* Rabbenu Chananel (Brachot 9b) holds one should say Vatakin by saying Shema specifically at HaNetz and not shortly before. This is also the opinion of Bal Hamoar (Beginning of Brachot), Roke’ach 3320 pg 211, and Avudraham (Shacharit Chol 1) who says Rabbenu Hai Goan would say the brachot before HaNetz and Shema only at HaNetz, and Rabbenu Tam (Sefer Yashar Sh”t 8:1) holds like Rabbenu Chananel but for a different reason.  
* S”A 58 and Bach 58 hold like majority of the Rishonim. So holds most Achronim. Yet Pri Chadash 58:1, Chisdei David (beginning of Brachot), Ohel Moed (Kriyat Shema 3) argue on S”A and hold like Rambam and Rif. However, Birkei Yosef 58:2 explains that S”A didn’t rule like Rif and Rambam even though usually S”A rules like the majority of the pillars of halacha who are the Rif, Rambam, and Rosh, here he wasn’t sure of the opinion of the Rif as the Rosh and Talmedei Rabbenu Yonah don’t mention his opinion.  
* S”A 58 and Bach 58 hold like majority of the Rishonim. This is also the opinion of most Achronim. Yet Pri Chadash 58:1, Chisdei David (beginning of Brachot), Ohel Moed (Kriyat Shema 3) argue on S”A and hold like Rambam and Rif. However, Birkei Yosef 58:2 explains that S”A didn’t rule like Rif and Rambam even though usually S”A rules like the majority of the pillars of halacha who are the Rif, Rambam, and Rosh, here he wasn’t sure of the opinion of the Rif as the Rosh and Talmedei Rabbenu Yonah don’t mention his opinion.  
* Sh”t Ish Matzliach O”C 1:15 pg 42 s.v. Yotzer Or) the Brachot Kriyat Shema can also only be said when one can recognize an acquaintance from 4 amot. This is also the opinion of Halacha Brurah 58:2.  
* Sh”t Ish Matzliach O”C 1:15 pg 42 s.v. Yotzer Or) the Brachot Kriyat Shema can also only be said when one can recognize an acquaintance from 4 amot. This is also the opinion of Halacha Brurah 58:2.  
* Rav Moshe Feinstein in Iggeros Moshe OC 4:6 rules that misheyakir is 35 minutes before sunrise. Rav Yaakov Kamenetsky in Emes liyaakov OC 58:1 rules that it is 36 minutes before sunrise. </ref>
* Rav Moshe Feinstein in Iggeros Moshe OC 4:6 rules that misheyakir is 35 minutes before sunrise. Rav Yaakov Kamenetsky in Emes liyaakov OC 58:1 rules that it is 36 minutes before sunrise. </ref>
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# If one know that one will not be able to have any Kavana when the time comes for Shema he is allowed to say it from Olot. <ref> Magan Avraham 58:3, Bear Heteiv 58:4, Solet Belulah 58:3, Shalmei Tzibbur pg 93d, Shulchan Aruch HaRav 58:6, Chaye Adam 21:3, Shtilei Zetim 58:10, Mishna Brurah 58:12, Kaf HaChaim 58:14, and Halacha Brurah 58:9. </ref>
# If one know that one will not be able to have any Kavana when the time comes for Shema he is allowed to say it from Olot. <ref> Magan Avraham 58:3, Bear Heteiv 58:4, Solet Belulah 58:3, Shalmei Tzibbur pg 93d, Shulchan Aruch HaRav 58:6, Chaye Adam 21:3, Shtilei Zetim 58:10, Mishna Brurah 58:12, Kaf HaChaim 58:14, and Halacha Brurah 58:9. </ref>
# In a Shat HaDachak at [[Olot HaShachar]], one can only say Shema with the Bracha of Ahavat Olam/ Ahava Rabba. When the time for Shema comes, meaning an hour before HaNetz, one can Lechatchila say Yotzer Or. If one also says Yotzer Or after Olot he has what to rely on. <ref> S”A 58:3 says in Shat HaDachak one can even say Yotzer Or from [[Olot HaShachar]] based on Rashba (Brachot 8b). However Magan Avraham 58:5 argues that the Rashba only holds that way because he holds that one must say the Brachot in order but since S”A 60 holds that can say it out of order one shouldn’t say Yotzer Or after Olot. The Gra agrees and says that so is the opinion of the Rambam (Tamidin UMusafin 6:4). This is also the opinion of Buir Hetiev 58:5, Pri Megadim A”A 58:5, Shulchan Aruch HaRav 58:6, Magan Giborim 58:6, and Mishna Brurah 58:17. However some Rishonim allow Yotzer to be said at Olot including Rokeach 320 pg 210, Nemukei Yosef Brachot 8b, Orchot Chaim (Kriyat Shema 6), and Sefer HaBatim (Kriyat Shema 2:7). Also some Achronim argue with the Magan Avraham including Eliyah Raba 58:7, Levush 58:3, Shulchan HaGavoha 58:9, Siddur Bet Ovad (Kriyat Shema 5), and Kaf HaChaim 58:19. </ref>
# In a Shat HaDachak at [[Olot HaShachar]], one can only say Shema with the Bracha of Ahavat Olam/ Ahava Rabba. When the time for Shema comes, meaning an hour before HaNetz, one can Lechatchila say Yotzer Or. If one also says Yotzer Or after Olot he has what to rely on. <ref> S”A 58:3 says in Shat HaDachak one can even say Yotzer Or from [[Olot HaShachar]] based on Rashba (Brachot 8b). However Magan Avraham 58:5 argues that the Rashba only holds that way because he holds that one must say the Brachot in order but since S”A 60 holds that can say it out of order one shouldn’t say Yotzer Or after Olot. The Gra agrees and says that so is the opinion of the Rambam (Tamidin UMusafin 6:4). This is also the opinion of Buir Hetiev 58:5, Pri Megadim A”A 58:5, Shulchan Aruch HaRav 58:6, Magan Giborim 58:6, and Mishna Brurah 58:17. However some Rishonim allow Yotzer to be said at Olot including Rokeach 320 pg 210, Nemukei Yosef Brachot 8b, Orchot Chaim (Kriyat Shema 6), and Sefer HaBatim (Kriyat Shema 2:7). Also some Achronim argue with the Magan Avraham including Eliyah Raba 58:7, Levush 58:3, Shulchan HaGavoha 58:9, Siddur Bet Ovad (Kriyat Shema 5), and Kaf HaChaim 58:19. </ref>
# If one said Shema at [[Olot HaShachar]] even though it wasn’t a Shat HaDachak has fulfilled his obligation Bedieved unless one is regular to say Shema at [[Olot HaShachar]] when it’s not a Shat HaDachak. If one’s regular to say it more than once a month at Olot when not a Shat HaDachak one doesn’t fulfill his oblkigation and must repeat at the proper time. <ref> S”A 58:4 rules that Bedieved one fulfills his obligation even though it wasn’t Shat HaDachak based on Rif (Beginning of Brachot), Rambam (Kriyat Shema 1:12), and Rosh (Brachot 1:9). A minority opinion [of Bal HaMoar and Nemukei Yosef Brachot 8b] is that one doesn’t fulfill the obligation even bedieved if it wasn’t a Shat HaDachak. However if one is regular to say Shema at Olot then one doesn’t fulfill his obligation. So holds Tur and Bet Yosef 58. Bach 58 says it was left out of S”A because it’s obvious. However Gra 58:10 argues that the Rif holds one does fulfill his obligation. Many Achronim define the time for someone regular to say Shema at Olot as someone who says it once a month including Bach, Sharei Knesset HaGedolah 58:7, Eliyah Raba 58:8, Bear Heteiv 58:6, Mishna Brurah 58:19, Kaf HaChaim 58:20, and Halacha Brurah 58:11 [against Birkei Yosef 58:6 who suggest that saying it twice or three times is called someone regular]. However if one is says it at Olot because of a Shat HaDachak one isn’t called ‘regular’ to say Shema at Olot. So says Chaye Adam 21:3, Mishna Brurah 58:19, Kaf HaChaim 58:16, and Halacha Brurah 58:11. </ref>
# If one said Shema at [[Olot HaShachar]] even though it wasn’t a Shat HaDachak has fulfilled his obligation Bedieved unless one is regular to say Shema at [[Olot HaShachar]] when it’s not a Shat HaDachak. If one’s regular to say it more than once a month at Olot when not a Shat HaDachak one doesn’t fulfill his oblkigation and must repeat at the proper time. <ref> S”A 58:4 rules that Bedieved one fulfills his obligation even though it wasn’t Shat HaDachak based on Rif (Beginning of Brachot), Rambam (Kriyat Shema 1:12), and Rosh (Brachot 1:9). A minority opinion [of Bal HaMoar and Nemukei Yosef Brachot 8b] is that one doesn’t fulfill the obligation even bedieved if it wasn’t a Shat HaDachak. However if one is regular to say Shema at Olot then one doesn’t fulfill his obligation. This is also the opinion of Tur and Bet Yosef 58. Bach 58 says it was left out of S”A because it’s obvious. However Gra 58:10 argues that the Rif holds one does fulfill his obligation. Many Achronim define the time for someone regular to say Shema at Olot as someone who says it once a month including Bach, Sharei Knesset HaGedolah 58:7, Eliyah Raba 58:8, Bear Heteiv 58:6, Mishna Brurah 58:19, Kaf HaChaim 58:20, and Halacha Brurah 58:11 [against Birkei Yosef 58:6 who suggest that saying it twice or three times is called someone regular]. However if one is says it at Olot because of a Shat HaDachak one isn’t called ‘regular’ to say Shema at Olot. So says Chaye Adam 21:3, Mishna Brurah 58:19, Kaf HaChaim 58:16, and Halacha Brurah 58:11. </ref>


== Saying Shema of Arvit after HaNetz==
== Saying Shema of Arvit after HaNetz==
# If due to an Ones (extenuating circumstance) like a sickness one missed saying Shema at the beginning of night one can say Shema of Arvit with brachot until HaNetz however one doesn’t say the bracha of Hashkivenu after [[Olot HaShachar]]. <ref> S”A 58:5, however one doesn’t make the bracha Hashkivenu (S”A 235:4 based on Tosfot (Brachot 9a), Mordechai Brachot 1:2, Rambam (Kriyat Shema 1:10), Rosh (Brachot 1:9), and Rabbenu Yerucham 3:2.). On Brachot 8b, Rabbi Shimon Ben Yochai says that it’s possible to say Shema twice at night once before Olot for the obligation of night and once after Olot for the day obligation. Many Rishonim hold that one can only use this leniency if one didn’t say Shema because of an Ones such as an illness (or a state of total drunkenness in which one can’t say Shema) including Talmedei Rabbenu Yonah 2a in name of the Rif, Rambam (Kriyat Shema 1:10), Ravan 135, Meiri, Hagahot Maimon (Kriyat Shema 1:6), Eshkol 1:5 pg 10, Rosh 1:9, Smag (Asin 18 pg 99c), and Smak 104. However some Rishonim say even if it wasn’t an ones Bedieved one fulfills his obligation including Bal HaMoar (Beginning of Brachot), Riaz (Brachot 1:1(4)), Rivivan Brachot 8b, and Ritva (Brachot 9a). S”A 58:5 and 235:4 says one can only fulfill Shema of Arvit after Olot if one was an ones. So holds the Acronim including Gra 58:14, Pri Megadim M”Z 58:3, and Halacha Brurah 58:12.</ref>
# If due to an Ones (extenuating circumstance) like a sickness one missed saying Shema at the beginning of night one can say Shema of Arvit with brachot until HaNetz however one doesn’t say the bracha of Hashkivenu after [[Olot HaShachar]]. <ref> S”A 58:5, however one doesn’t make the bracha Hashkivenu (S”A 235:4 based on Tosfot (Brachot 9a), Mordechai Brachot 1:2, Rambam (Kriyat Shema 1:10), Rosh (Brachot 1:9), and Rabbenu Yerucham 3:2.). On Brachot 8b, Rabbi Shimon Ben Yochai says that it’s possible to say Shema twice at night once before Olot for the obligation of night and once after Olot for the day obligation. Many Rishonim hold that one can only use this leniency if one didn’t say Shema because of an Ones such as an illness (or a state of total drunkenness in which one can’t say Shema) including Talmedei Rabbenu Yonah 2a in name of the Rif, Rambam (Kriyat Shema 1:10), Ravan 135, Meiri, Hagahot Maimon (Kriyat Shema 1:6), Eshkol 1:5 pg 10, Rosh 1:9, Smag (Asin 18 pg 99c), and Smak 104. However some Rishonim say even if it wasn’t an ones Bedieved one fulfills his obligation including Bal HaMoar (Beginning of Brachot), Riaz (Brachot 1:1(4)), Rivivan Brachot 8b, and Ritva (Brachot 9a). S”A 58:5 and 235:4 says one can only fulfill Shema of Arvit after Olot if one was an ones. This is also the opinion of the Acronim including Gra 58:14, Pri Megadim M”Z 58:3, and Halacha Brurah 58:12.</ref>
# If due to an Ones one said Shema of Arvit after Olot then one can’t Shema of Shacharit before HaNetz (not even at the time of MeSheyakir, an hour before HaNetz <ref>this is a dispute in the Achronim if one said Shema of Arvit after Olot before Mesheyakir whether one can say Shema of Shacharit after Mesheyakir before HaNetz. Minchat Cohen (Mevo Shemesh 1:14) and Kaf HaChaim 58:21 say that one can say one Shema before Mesheyakir and one afterwards. Eliyah Rabba 58:9, Pri Megadim M”Z 58:3, Levush 58:5, Erech HaShulchan 58:2, Chaye Adam 34:5, Ben Ish Chai Vaera 4, Mishna Brurah 58:22 and Halacha Brurah 58:13 say if one said Shema after Olot one can’t say Shema of Shacharit before HaNetz. </ref>) even if it’s a Shat HaDachak since he already established that time as night by saying Shema of Arvit. <Ref> Rosh (Brachot 1:9) writes that logically one should not be able to say Shema of Arvit and Shacharit in the same time period. Rather, says the Bet Yosef 58, one should say Shema of Arvit even if one will miss Shema of Shacharit, because it’s better to passively not say Shema of Shacharit than pass up Shema of Arvit actively by saying Shema of Shacharit after Olot. S”A 58:5 rules like the Rosh. However the Gra 58:14, Pri Chadash 58:5, Eliyah Rabba 58:9,  argues that the Tur doesn’t quote this because he holds one can say two Shema’s in one time period. Mishna Brurah 58:21 quotes this opinion as Yesh Cholkin”(some argue). Halacha Brurah 58:13 rules like S”A. </ref>
# If due to an Ones one said Shema of Arvit after Olot then one can’t Shema of Shacharit before HaNetz (not even at the time of MeSheyakir, an hour before HaNetz <ref>this is a dispute in the Achronim if one said Shema of Arvit after Olot before Mesheyakir whether one can say Shema of Shacharit after Mesheyakir before HaNetz. Minchat Cohen (Mevo Shemesh 1:14) and Kaf HaChaim 58:21 say that one can say one Shema before Mesheyakir and one afterwards. Eliyah Rabba 58:9, Pri Megadim M”Z 58:3, Levush 58:5, Erech HaShulchan 58:2, Chaye Adam 34:5, Ben Ish Chai Vaera 4, Mishna Brurah 58:22 and Halacha Brurah 58:13 say if one said Shema after Olot one can’t say Shema of Shacharit before HaNetz. </ref>) even if it’s a Shat HaDachak since he already established that time as night by saying Shema of Arvit. <Ref> Rosh (Brachot 1:9) writes that logically one should not be able to say Shema of Arvit and Shacharit in the same time period. Rather, says the Bet Yosef 58, one should say Shema of Arvit even if one will miss Shema of Shacharit, because it’s better to passively not say Shema of Shacharit than pass up Shema of Arvit actively by saying Shema of Shacharit after Olot. S”A 58:5 rules like the Rosh. However the Gra 58:14, Pri Chadash 58:5, Eliyah Rabba 58:9,  argues that the Tur doesn’t quote this because he holds one can say two Shema’s in one time period. Mishna Brurah 58:21 quotes this opinion as Yesh Cholkin”(some argue). Halacha Brurah 58:13 rules like S”A. </ref>
# If one usually prays at Vatikin saying Shema of Shacharit right before HaNetz, if one had an ones and had to say Shema of Arvit after Olot, before Mesheyakir, one should say Shema of Shacharit before HaNetz with a stipulation “If one can say Shema twice before HaNetz, I want to fulfill Shema of Shacharit with this reading, if one can’t say two Shema’s before HaNetz I don’t want fulfill my obligation of Shema of Shacharit but only to juxtapose Shema to [[Shemoneh Esrei]]” and then after HaNetz one should repeat Shema. <Ref> Sh”t Ish Matzliach on Mishna Brurah 58 says that it should work without a stipulation because of Safek Sefeka whether the law is like the Rosh and one can’t say Shema twice after Olot, or not and whether this law only applies from Olot to Mesheyakit or until HaNetz. Yet he concludes that it’s preferable one make a stipulation. Halacha Brurah 58:13 argues on the Safek Safeka but seemingly doesn’t argue on the stipulation. </ref>
# If one usually prays at Vatikin saying Shema of Shacharit right before HaNetz, if one had an ones and had to say Shema of Arvit after Olot, before Mesheyakir, one should say Shema of Shacharit before HaNetz with a stipulation “If one can say Shema twice before HaNetz, I want to fulfill Shema of Shacharit with this reading, if one can’t say two Shema’s before HaNetz I don’t want fulfill my obligation of Shema of Shacharit but only to juxtapose Shema to [[Shemoneh Esrei]]” and then after HaNetz one should repeat Shema. <Ref> Sh”t Ish Matzliach on Mishna Brurah 58 says that it should work without a stipulation because of Safek Sefeka whether the law is like the Rosh and one can’t say Shema twice after Olot, or not and whether this law only applies from Olot to Mesheyakit or until HaNetz. Yet he concludes that it’s preferable one make a stipulation. Halacha Brurah 58:13 argues on the Safek Safeka but seemingly doesn’t argue on the stipulation. </ref>


== When to say it if one missed Vatikin (HaNetz)==
== When to say it if one missed Vatikin (HaNetz)==
# If one doesn’t say Shema at HaNetz one should say it as soon as possible. However one shouldn’t say it earlier beyachid if one can say it later with a minyan before the latest time for Shema. <ref> Halacha Brurah 58:8 says that one should wait for a minyan if one won’t miss the time for Shema. So holds Sh”T Nodea BeYehuda (Kama O”C 3), Mishna Brurah 58:5, Sh”t Eleph Lacha Shlomo O”C 47 that only one will miss the time of Shema should one say it Beyachid. </ref>
# If one doesn’t say Shema at HaNetz one should say it as soon as possible. However one shouldn’t say it earlier beyachid if one can say it later with a minyan before the latest time for Shema. <ref> Halacha Brurah 58:8 says that one should wait for a minyan if one won’t miss the time for Shema. This is also the opinion of Sh”T Nodea BeYehuda (Kama O”C 3), Mishna Brurah 58:5, Sh”t Eleph Lacha Shlomo O”C 47 that only one will miss the time of Shema should one say it Beyachid. </ref>


== Latest time==
== Latest time==
# The latest time for Kriyat Shema is the end of the third hour (in [[Shaot Zmaniot]] <ref> S”A 58, 89:1 based on Rambam in Sh”t Pear Hadar 44 writes that all times of Chazal are [[Shaot Zmaniot]] and in Hilchot Tefilah 3 (where he equates 4 hours with a third of the day). So holds the Meiri Brachot 9b, Rav Ovadyah MeBarentura, and Sh”t Maharil 163. However Tosfot HaRosh Brachot 3b s.v. Kiyvan writes to calculate the hours equally all year round. The Achronim rule like S”A including Pri Chadash 58:2, Sh”t Shagat Aryeh 5e, Shulchan Gavoha 58:13, Shulchan Aruch HaRav 58:3, Chaye Adam 21:3, Kitzur Shulchan Aruch 17:1, Sh”t Rav Poalim 2:2,3,19, Ben Ish Chai Vaera 5, Sh”t Chesed LeAvraham Teomim Kama O”C 7, Mishna Brurah 58:5. </ref>) which is a quarter of the day. <Ref> Brachot 9b has a dispute of the latest time for Shema. The Gemara 10b rules like Rabbi Yehoshua who says that it’s the 3rd hour. So hold the Rambam(Kriyat Shema 1:11), Tur, and S”A 58:6. Rambam, Meiri Brachot 9b, Talmedei Rabbenu Yonah 4b hold that after HaNetz until the 3rd hour is only bedieved (after the fact. However implied from majority of Rishonim(including Tur and S”A) is that it’s even Lechatchila. Machsor Vitri (1 pg 7), Yerayim 13, Roke’ach 320, Ravyah 1:15, Rabbenu Yehonatan Melunil (Brachot 1), Siddur Rav Amram 1:15-6 rule the ending time is the beginning of the third hour. However S”A 58:6 rules it’s the end of the 3rd hour based on majority of Rishonim including Tosfot (Avofda Zara 4b s.v. Betelat), Smag (Asin 18), Smak 104, Rambam (Kriyat Shema 1:11), Meharam Rikatani 5, Piskei Rid (Brachot 10b), Piskei Riaz, Eshkol 1:5, Chinuch 420, Meiri (Brachot 9b), Sefer HaBatim (Shema 2:6), Orchot Chaim (Shema 5), Rashbetz (Brachot 10b). Exactly how to calculate the end of the third hour is an argument of the poskim. The gra says that the day begins at sunrise and ends at sunset while the Magen Avraham says days begins at alot hashachar and ends at tzet hakochavim. Mishna Brurah 58:4 quotes both opinions and doesn’t make a ruling. Aruch hashulchan 58:14; Chazon Ish OC 13:3-4, Sh”t Iggerot Moshe OC 1:24, YD 3:129:3, Sh”t Minchat Yitzchak 3:71, all seem to accept the later time of the Gra. See however, Sh”t Teshuvot viHanhagot 1:56 quoting Rav Aharon Kotler and Orchos Rabbeinu 1:53 quoting the Steipler.  </ref>
# The latest time for Kriyat Shema is the end of the third hour (in [[Shaot Zmaniot]] <ref> S”A 58, 89:1 based on Rambam in Sh”t Pear Hadar 44 writes that all times of Chazal are [[Shaot Zmaniot]] and in Hilchot Tefilah 3 (where he equates 4 hours with a third of the day). This is also the opinion of the Meiri Brachot 9b, Rav Ovadyah MeBarentura, and Sh”t Maharil 163. However Tosfot HaRosh Brachot 3b s.v. Kiyvan writes to calculate the hours equally all year round. The Achronim rule like S”A including Pri Chadash 58:2, Sh”t Shagat Aryeh 5e, Shulchan Gavoha 58:13, Shulchan Aruch HaRav 58:3, Chaye Adam 21:3, Kitzur Shulchan Aruch 17:1, Sh”t Rav Poalim 2:2,3,19, Ben Ish Chai Vaera 5, Sh”t Chesed LeAvraham Teomim Kama O”C 7, Mishna Brurah 58:5. </ref>) which is a quarter of the day. <Ref> Brachot 9b has a dispute of the latest time for Shema. The Gemara 10b rules like Rabbi Yehoshua who says that it’s the 3rd hour. So hold the Rambam(Kriyat Shema 1:11), Tur, and S”A 58:6. Rambam, Meiri Brachot 9b, Talmedei Rabbenu Yonah 4b hold that after HaNetz until the 3rd hour is only bedieved (after the fact. However implied from majority of Rishonim(including Tur and S”A) is that it’s even Lechatchila. Machsor Vitri (1 pg 7), Yerayim 13, Roke’ach 320, Ravyah 1:15, Rabbenu Yehonatan Melunil (Brachot 1), Siddur Rav Amram 1:15-6 rule the ending time is the beginning of the third hour. However S”A 58:6 rules it’s the end of the 3rd hour based on majority of Rishonim including Tosfot (Avofda Zara 4b s.v. Betelat), Smag (Asin 18), Smak 104, Rambam (Kriyat Shema 1:11), Meharam Rikatani 5, Piskei Rid (Brachot 10b), Piskei Riaz, Eshkol 1:5, Chinuch 420, Meiri (Brachot 9b), Sefer HaBatim (Shema 2:6), Orchot Chaim (Shema 5), Rashbetz (Brachot 10b). Exactly how to calculate the end of the third hour is an argument of the poskim. The gra says that the day begins at sunrise and ends at sunset while the Magen Avraham says days begins at alot hashachar and ends at tzet hakochavim. Mishna Brurah 58:4 quotes both opinions and doesn’t make a ruling. Aruch hashulchan 58:14; Chazon Ish OC 13:3-4, Sh”t Iggerot Moshe OC 1:24, YD 3:129:3, Sh”t Minchat Yitzchak 3:71, all seem to accept the later time of the Gra. See however, Sh”t Teshuvot viHanhagot 1:56 quoting Rav Aharon Kotler and Orchos Rabbeinu 1:53 quoting the Steipler.  </ref>
# If one didn’t say Shema before the third hour, one can still say it with Brachot until the end of the forth hour; but one doesn’t fulfill Shema in it’s proper time. <ref> Brachot 9b says if one missed the time for Kriyat Shema one can read it with Brachot. Rambam (Kriyat Shema 1:13), Rif (Brachot 9b), Bahag, Shiltei Giborim (Brachot 10b in name of Smag, Ravyah 25 pg 14, Sefer Chinuch 420, Rid (Brachot 10b), and Riaz Brachot 1:1(7) hold that one can make the Brachot the entire day. However the Rosh Brachot 1:10 quotes Rav Hai Goan that one can only say the Brachot until the 4th hour. So holds Rabbenu Chananel (Brachot 10b), Or Zaruha 1:16, Siddur Rav Sadyah Goan 13, Meiri (Brachot 10b), Ravan 139, Tur and S”A 58:6. Most Achronim agree with S”A including Levush 58:6, Bach, Taz 58:4, Petach Dvir 2 pg 18a in name of Rav Chaim Vital, Shulchan Gavoha 58:12, Siddur Yavetz , Gra 58:15, Pri Megadim M”Z 58:4, Shulchan Aruch HaRav 58:10, Chaye Adam 21:3, Kaf HaChaim 58:25, and Halacha Brurah 58:14. However some argue on S”A allow one to say Brachot all day including Sh”t Radvaz 2:156, Pri Chadash 58:6, Rav Chaim Ben Atar in Rishon LeTzion (Brachot 10b), Sh”t Chaim Shal 2:38(70), Keshur Gudal 6:4, and Erech HaShulchan 58:3. </ref>
# If one didn’t say Shema before the third hour, one can still say it with Brachot until the end of the forth hour; but one doesn’t fulfill Shema in it’s proper time. <ref> Brachot 9b says if one missed the time for Kriyat Shema one can read it with Brachot. Rambam (Kriyat Shema 1:13), Rif (Brachot 9b), Bahag, Shiltei Giborim (Brachot 10b in name of Smag, Ravyah 25 pg 14, Sefer Chinuch 420, Rid (Brachot 10b), and Riaz Brachot 1:1(7) hold that one can make the Brachot the entire day. However the Rosh Brachot 1:10 quotes Rav Hai Goan that one can only say the Brachot until the 4th hour. This is also the opinion of Rabbenu Chananel (Brachot 10b), Or Zaruha 1:16, Siddur Rav Sadyah Goan 13, Meiri (Brachot 10b), Ravan 139, Tur and S”A 58:6. Most Achronim agree with S”A including Levush 58:6, Bach, Taz 58:4, Petach Dvir 2 pg 18a in name of Rav Chaim Vital, Shulchan Gavoha 58:12, Siddur Yavetz , Gra 58:15, Pri Megadim M”Z 58:4, Shulchan Aruch HaRav 58:10, Chaye Adam 21:3, Kaf HaChaim 58:25, and Halacha Brurah 58:14. However some argue on S”A allow one to say Brachot all day including Sh”t Radvaz 2:156, Pri Chadash 58:6, Rav Chaim Ben Atar in Rishon LeTzion (Brachot 10b), Sh”t Chaim Shal 2:38(70), Keshur Gudal 6:4, and Erech HaShulchan 58:3. </ref>
# If one didn’t say Shema before the forth hour one should say it without Brachot until the end of the day. Ashkenazim can say it with Brachot until Chatzot if it was an ones. <Ref> Halacha Brurah goes according to S”A that after the forth hour one can make the Brachot. However Mishna Brurah (Beiur Halacha s.v. Korah Bli Bracha) says one can rely on the Mishkanot Yacov O”C 80 and Maharil to say it with Brachot until Chatzot. </ref>
# If one didn’t say Shema before the forth hour one should say it without Brachot until the end of the day. Ashkenazim can say it with Brachot until Chatzot if it was an ones. <Ref> Halacha Brurah goes according to S”A that after the forth hour one can make the Brachot. However Mishna Brurah (Beiur Halacha s.v. Korah Bli Bracha) says one can rely on the Mishkanot Yacov O”C 80 and Maharil to say it with Brachot until Chatzot. </ref>
# One can rely on the time of the Gra to make the Brachot Shema until the end of the forth hour.  <Ref>Yalkut Yosef 1:109 and Halacha Brurah 58:14 based on a Safek Safeka with many Rishonim that allow one to make the Brachot all day and that Brachot Kriyat Shema may be Deoritta as well as the fact that many Rishonim that say to count the time of the Gra. Even though most of the time a Safek Safeka isn’t enough to make Brachot (Sh”t Yachave Daat 5:21 in the note) here it’s sufficient. </ref>
# One can rely on the time of the Gra to make the Brachot Shema until the end of the forth hour.  <Ref>Yalkut Yosef 1:109 and Halacha Brurah 58:14 based on a Safek Safeka with many Rishonim that allow one to make the Brachot all day and that Brachot Kriyat Shema may be Deoritta as well as the fact that many Rishonim that say to count the time of the Gra. Even though most of the time a Safek Safeka isn’t enough to make Brachot (Sh”t Yachave Daat 5:21 in the note) here it’s sufficient. </ref>