Mishneh Torah — Sanctification of the New Month הלכות קידוש החודש, Chapter 4

שָׁנָּה מְעֻבֶּרֶת הִיא שָׁנָה שֶׁמּוֹסִיפִין בָּהּ חֹדֶשׁ. וְאֵין מוֹסִיפִין לְעוֹלָם אֶלָּא אֲדָר וְעוֹשִׂין אוֹתָהּ שָׁנָה שְׁנֵי אֲדָרִין אֲדָר רִאשׁוֹן וַאֲדָר שֵׁנִי. וּמִפְּנֵי מָה מוֹסִיפִין חֹדֶשׁ זֶה מִפְּנֵי זְמַן הָאָבִיב כְּדֵי שֶׁיְּהֵא הַפֶּסַח בְּאוֹתוֹ זְמַן שֶׁנֶּאֱמַר (דברים טז א) "שָׁמוֹר אֶת חֹדֶשׁ הָאָבִיב" שֶׁיִּהְיֶה חֹדֶשׁ זֶה בִּזְמַן הָאָבִיב. וְלוּלֵא הוֹסָפַת הַחֹדֶשׁ הַזֶּה הַפֶּסַח בָּא פְּעָמִים בִּימוֹת הַחַמָּה וּפְעָמִים בִּימוֹת הַגְּשָׁמִים:

A leap year is a year that includes an additional month.The extra month that is added is always Adar, (commenting on Exodus 12:2 states that just as when a month is made full the addition is made at the end of the month, so too, when a year is made full the addition is made at the end. (The year is considered as beginning in Nisan and ending in Adar.) and thus the year contains two Adarin: the first Adar and the second Adar. 10:6, it appears that the Rambam considers the first Adar to be the additional month of the leap year. The Tur and the Ramah (Orach Chayim 427:1) differ and consider the second Adar to be the additional month.In practice, Purim is always celebrated in the second Adar (Hilchot Megillah 1:12). There is a difference of opinion with regard to whether to commemorate birthdays, yahrzeits, and the like that took place in Adar of an ordinary year in the first or the second Adar of a leap year. The accepted custom in the Ashkenazic community is to commemorate them in the first Adar of a leap year (Kitzur Shulchan Aruch 221:3).Why is this month added? Because of the season of spring, so that Pesach will fall then, as [implied by Deuteronomy 16:1]: "Take heed the month of spring" [This command can be interpreted to mean, "Take heed] that this month falls in the spring season. Were the month [of Adar] not to be added [from time to time], there are times when Pesach would fall in the summer, and times [when it would fall] in the rainy season.

עַל שְׁלֹשָׁה סִימָנִין מְעַבְּרִין אֶת הַשָּׁנָה. עַל הַתְּקוּפָה וְעַל הָאָבִיב וְעַל פֵּרוֹת הָאִילָן. כֵּיצַד. בֵּית דִּין מְחַשְּׁבִין וְיוֹדְעִין אִם תִּהְיֶה תְּקוּפַת נִיסָן בְּשִׁשָּׁה עָשָׂר בְּנִיסָן אוֹ אַחַר זְמַן זֶה מְעַבְּרִין אוֹתָהּ הַשָּׁנָה. וְיַעֲשׂוּ אוֹתוֹ נִיסָן אֲדָר שֵׁנִי כְּדֵי שֶׁיִּהְיֶה הַפֶּסַח בִּזְמַן הָאָבִיב. וְעַל סִימָן זֶה סוֹמְכִין וּמְעַבְּרִין וְאֵין חוֹשְׁשִׁין לְסִימָן אַחֵר:

[An extra month is added,] making the year full, because of three factors: a) the vernal [spring] equinox; b) the ripening [of the barley crop], and c) the blooming of the fruit trees.What is implied? When the court calculates and determines that the vernal equinox will fall on the sixteenth of Nisan or later, the year is made full. The month that would have been Nisan is made the second Adar, and thus Pesach will fall in the spring. This factor [alone] is sufficient for the court to make the year full; other factors need not be considered.

וְכֵן אִם רָאוּ בֵּית דִּין שֶׁעֲדַיִן לֹא הִגִּיעַ הָאָבִיב אֶלָּא עֲדַיִן אָפֵל הוּא. וְלֹא צָמְחוּ פֵּרוֹת הָאִילָן שֶׁדַּרְכָּן לִצְמֹחַ בִּזְמַן הַפֶּסַח. סוֹמְכִין עַל שְׁנֵי סִימָנִין אֵלּוּ וּמְעַבְּרִין אֶת הַשָּׁנָה. וְאַף עַל פִּי שֶׁהַתְּקוּפָה קֹדֶם לְשִׁשָּׁה עָשָׂר בְּנִיסָן הֲרֵי הֵן מְעַבְּרִין. כְּדֵי שֶׁיִּהְיֶה הָאָבִיב מָצוּי לְהַקְרִיב מִמֶּנּוּ עֹמֶר הַתְּנוּפָה בְּשִׁשָּׁה עָשָׂר בְּנִיסָן. וּכְדֵי שֶׁיִּהְיוּ הַפֵּרוֹת צוֹמְחִין כְּדֶרֶךְ כָּל זְמַן הָאָבִיב:

Similarly, if the court sees that [the barley crop] has not ripened, but that it is late in sprouting, or that the fruit trees that usually bloom at the time of the Pesach holiday have not bloomed, these two factors are sufficient, and the year is made full, even though the vernal equinox will fall before the sixteenth of Nisan. 13a,b, the Ramah (cited in the gloss of the Kessef Mishneh on Halachah 15) notes that our Sages required that the festival of Sukkot occur after the autumnal equinox. If the vernal equinox falls on the fifteenth of Nisan, it is possible that the autumnal equinox will not take place until the twenty-first of Tishrei, six days after Sukkot begins.Several different perspectives are offered to resolve this point. Among them: The Or Sameach maintains that the Rambam's text originally contained a reference to the autumnal equinox, and it was omitted by the later printers. Aruch HaShulchan, by contrast, maintains that, according to the Rambam, the entire discussion in Sanhedrin is not accepted as halachah. We are not at all concerned with the autumnal equinox; all that is significant is that Pesach fall after the vernal equinox.[The reason the year is] made full [because of these factors] is so that there will be [an abundant quantity] of ripened [barley] accessible, so that the wave offering of the omer can be brought from it on the sixteenth of Nisan, 7:3. and so that the fruits will bloom, as they always do in the spring.

וְעַל שָׁלֹשׁ אֲרָצוֹת הָיוּ סוֹמְכִין בָּאָבִיב. עַל אֶרֶץ יְהוּדָה וְעַל עֵבֶר הַיַּרְדֵּן וְעַל הַגָּלִיל. וְאִם הִגִּיעַ הָאָבִיב בִּשְׁתֵּי אֲרָצוֹת מֵאֵלּוּ וּבְאַחַת לֹא הִגִּיעַ אֵין מְעַבְּרִין. וְאִם הִגִּיעַ בְּאַחַת מֵהֶן וְלֹא הִגִּיעַ בִּשְׁתַּיִם מְעַבְּרִין אִם עֲדַיִן לֹא צָמְחוּ פֵּרוֹת הָאִילָן. וְאִלּוּ הֵן הַדְּבָרִים שֶׁהֵן הָעִקָּר שֶׁמְּעַבְּרִין בִּשְׁבִילָן כְּדֵי שֶׁיִּהְיוּ הַשָּׁנִים שְׁנֵי חַמָּה:

There are three territories that are of consequence regarding the ripening [of the barley]: Judea, Transjordan, and the Galilee. If [the barley] ripened in two of these lands, but not in the third, the year is not made full. If, however, [the barley] ripened in one of these lands, but not in the other two, the year is made full if the fruit trees have not bloomed.These are the primary grounds for making the year full, so that the years will follow the solar calendar.

וְיֵשׁ שָׁם דְּבָרִים אֲחֵרִים שֶׁהָיוּ בֵּית דִּין מְעַבְּרִין בִּשְׁבִילָן מִפְּנֵי הַצֹּרֶךְ. וְאֵלּוּ הֵן. מִפְּנֵי הַדְּרָכִים שֶׁאֵינָן מְתֻקָּנִין וְאֵין הָעָם יְכוֹלִין לַעֲלוֹת מְעַבְּרִין אֶת הַשָּׁנָה עַד שֶׁיִּפָּסְקוּ הַגְּשָׁמִים וִיתַקְּנוּ הַדְּרָכִים. וּמִפְּנֵי הַגְּשָׁרִים שֶׁנֶּהֶרְסוּ וְנִמְצְאוּ הַנְּהָרוֹת מַפְסִיקִין וּמוֹנְעִין אֶת הָעָם וּמִסְתַּכְּנִין בְּעַצְמָן וּמֵתִים מְעַבְּרִין אֶת הַשָּׁנָה עַד שֶׁיְּתַקְּנוּ הַגְּשָׁרִים. וּמִפְּנֵי תַּנּוּרֵי פְּסָחִים שֶׁאָבְדוּ בַּגְּשָׁמִים וְאֵין לָהֶם מָקוֹם לִצְלוֹת אֶת פִּסְחֵיהֶם מְעַבְּרִין אֶת הַשָּׁנָה עַד שֶׁיִּבָּנוּ הַתַּנּוּרִים וְיִיבְשׁוּ. וּמִפְּנֵי גָּלֻיּוֹת יִשְׂרָאֵל שֶׁנֶּעֶקְרוּ מִמְּקוֹמָן וַעֲדַיִן לֹא הִגִּיעוּ לִירוּשָׁלַיִם מְעַבְּרִין אֶת הַשָּׁנָה כְּדֵי שֶׁיִּהְיֶה לָהֶם פְּנַאי לְהַגִּיעַ:

There are other factors for which the court makes [the year full] in the case of necessity. Among them: that the roads are not suitable, and it is impossible for the people to make the pilgrimage. [In such an instance,] the year is made full, [to allow time for] the rains to stop and the roads to be fixed.That the bridges have been destroyed and there are rivers interrupting [the roads], and preventing the people [from continuing their journey]. The year is made full, so that the bridges can be fixed, lest the people endanger themselves and die.That the ovens for the Paschal sacrifice were destroyed by the rains, and thus there will be no place for [the people] to roast their Paschal offerings. We therefore make the year full, so that the ovens can be built and can dry [in the sun].That Jews from the diaspora who have left their homes have not arrived in Jerusalem. We make the year full, so that they will have the time to reach [Jerusalem]. 1:2) states that an effort should be made to enable the entire Jewish people to celebrate the pilgrimage festivals in Jerusalem.

אֲבָל אֵין מְעַבְּרִין אֶת הַשָּׁנָה לֹא מִפְּנֵי הַשֶּׁלֶג וְלֹא מִפְּנֵי הַצִּנָּה וְלֹא מִפְּנֵי גָּלֻיּוֹת יִשְׂרָאֵל שֶׁעֲדַיִן לֹא נֶעֶקְרוּ מִמְּקוֹמָם. וְלֹא מִפְּנֵי הַטֻּמְאָה. כְּגוֹן שֶׁהָיוּ רֹב הַקָּהָל אוֹ רֹב הַכֹּהֲנִים טְמֵאִים אֵין מְעַבְּרִין אֶת הַשָּׁנָה כְּדֵי שֶׁיִּהְיֶה לָהֶם פְּנַאי לִטַּהֵר וְיַעֲשׂוּ בְּטָהֳרָה אֶלָּא יַעֲשׂוּ בְּטֻמְאָה. וְאִם עִבְּרוּ אֶת הַשָּׁנָה מִפְּנֵי הַטֻּמְאָה הֲרֵי זוֹ מְעֻבֶּרֶת:

We do not, however, make the year full because of snow, nor because of a cold climate, 12a, writes that these factors will make the people's journey to Jerusalem uncomfortable, but will not prevent them from making the journey. nor because of Jews from the diaspora who have not yet left their homes.[Similarly, the year is not made full] because of ritual impurity - e.g., when most of the people or most of the priests are impure. (one of the few tractates of the Gemara on which the Rambam wrote a commentary), the Rambam quotes Rav Hai Gaon as explaining that this instance refers to a situation in which the people were impure because of contact with a human corpse, and no ashes from the red heifer remained to purify them. One might think that the year should be made full to enable the priests enough time to offer a new red heifer and prepare ashes. Therefore, our Sages feel it necessary to explain that this measure is not taken, and in this instance the Paschal sacrifice should be offered by a priest in a state of ritual impurity. The year is not made full so that they will be able to purify themselves and offer [the Paschal sacrifice] in a state of ritual purity.. On the other hand, when the majority of the Jewish people, or the majority of the priests, are impure, the sacrifice should be offered in a state of ritual impurity. (See Hilchot Korban Pesach 7:1; Hilchot Bi'at HaMikdash 4:16.) Instead, they should offer [the sacrifice] while ritually impure. Nevertheless, if the year has been made full because of ritual impurity, it may be left full.

יֵשׁ דְּבָרִים שֶׁאֵין מְעַבְּרִין בִּשְׁבִילָן כְּלָל אֲבָל עוֹשִׂין אוֹתָן סַעַד לְשָׁנָה שֶׁצְּרִיכָה עִבּוּר מִפְּנֵי הַתְּקוּפָה אוֹ מִפְּנֵי הָאָבִיב וּפֵרוֹת הָאִילָן. וְאֵלּוּ הֵן. מִפְּנֵי הַגְּדָיִים וְהַטְּלָאִים שֶׁעֲדַיִן לֹא נוֹלְדוּ אוֹ שֶׁהֵן מְעַט. ומִפְּנֵי הַגּוֹזָלוֹת שֶׁלֹּא פָּרְחוּ. אֵין מְעַבְּרִין בִּשְׁבִיל אֵלּוּ כְּדֵי שֶׁיִּהְיוּ הַגְּדָיִים וְהַטְּלָאִים מְצוּיִין לִפְסָחִים וְהַגּוֹזָלוֹת מְצוּיִין לִרְאִיָּה אוֹ לְמִי שֶׁנִּתְחַיֵּב בְּקָרְבַּן הָעוֹף. אֲבָל עוֹשִׂין אוֹתָן סַעַד לְשָׁנָה:

There are factors that, in and of themselves, are never sufficient cause to make the year full. They are, however, mentioned as contributing factors when a year must be made full so that [Pesach will fall after] the vernal equinox, because of [the barley that has not] ripened, or the fruit trees.These factors are: That young goats or lambs have not been born, or are merely few in number, or that young doves have not [matured to the point where they can] fly.We do not make the year full so that the goats and the lambs will be available for the Paschal sacrifices, and the doves will be available for the pilgrimage sacrifice, ("burnt") offering on the pilgrimage festivals. The Rambam maintains that doves could be brought for these offerings. (See Hilchot Chaggigah 1:1.) Other authorities differ, as explained in the commentaries on that halachah. or for those individuals (Leviticus 15:14 , and zavot (Leviticus 15:29 . It was customary for people living far from Jerusalem to delay offering the sacrifices they were obligated to bring until the pilgrimage festivals. who are obligated to bring doves as a sacrifice. Nevertheless, these are mentioned as contributing factors [to make] the year [full].

כֵּיצַד עוֹשִׂין אוֹתָן סַעַד לְשָׁנָה. אוֹמְרִין שָׁנָה זוֹ צְרִיכָה עִבּוּר מִפְּנֵי הַתְּקוּפָה שֶׁמָּשְׁכָה אוֹ מִפְּנֵי הָאָבִיב וּפֵרוֹת הָאִילָן שֶׁלֹּא הִגִּיעוּ וְעוֹד שֶׁהַגְּדָיִים קְטַנִּים וְהַגּוֹזָלוֹת רַכִּים:

What does mentioning them as contributing factors [to make] the year [full] imply? The court says: "This year must be made full because the equinox falls late, or because [the barley] has not ripened and the fruit trees have not bloomed, 11a), which states that the lack of lambs or doves coupled with either a delay in the ripening of the barley or the blooming of the fruit trees is sufficient cause to make the year full. and also because the young goats are small and the doves are frail."

אֵין מְעַבְּרִין אֶת הַשָּׁנָה אֶלָּא בִּמְזֻמָּנִין לָהּ. כֵּיצַד. יֹאמַר רֹאשׁ בֵּית דִּין הַגָּדוֹל לִפְלוֹנִי וּפְלוֹנִי מִן הַסַּנְהֶדְרִין הֱיוּ מְזֻמָּנִין לְמָקוֹם פְּלוֹנִי שֶׁנְּחַשֵּׁב וְנִרְאֶה וְנֵדַע אִם שָׁנָה זוֹ צְרִיכָה עִבּוּר אוֹ אֵינָהּ צְרִיכָה. וְאוֹתָן שֶׁהֻזְמְנוּ בִּלְבַד הֵן שֶׁמְּעַבְּרִין אוֹתָהּ. וּבְכַמָּה מְעַבְּרִין אוֹתָהּ. מַתְחִילִין בִּשְׁלֹשָׁה דַּיָּנִין מִכְּלַל סַנְהֶדְרֵי גְּדוֹלָה מִמִּי שֶּׁסָּמְכוּ אוֹתָן. אָמְרוּ שְׁנַיִם לֹא נֵשֵׁב וְלֹא נִרְאֶה אִם צְרִיכָה עִבּוּר אִם לָאו וְאֶחָד אָמַר נֵשֵׁב וְנִבְדֹּק. בָּטֵל יָחִיד בְּמִעוּטוֹ. אָמְרוּ שְׁנַיִם נֵשֵׁב וְנִרְאֶה וְאֶחָד אוֹמֵר לֹא נֵשֵׁב. מוֹסִיפִין עוֹד שְׁנַיִם מִן הַמְזֻמָּנִים וְנוֹשְׂאִים וְנוֹתְנִין בַּדָּבָר:

The year can be made full only by [judges] who were invited [to participate in the deliberations]. 11a, which relates that Rabban Gamliel once invited seven members of the Sanhedrin to participate in the deliberations regarding whether or not to make a year full. He requested that they meet him in the loft of the court early the following morning. When an additional member of the court came, Rabban Gamliel protested and taught the Sages this halachah. What is implied? The head of the High Court tells [several] members of the court, "Be present at a particular place, where we will make calculations and decide whether or not it is necessary to make the year full" It is only those who were invited who [have the authority to] make [the year] full.How many [judges participate in the deliberations whether] to declare a leap year? We begin with three judges from the High Court who have received semichah. Should two [of these judges] say, "There is no need to sit to decide whether or not [the year] should be made full" [their opinion is accepted]. [Although] one [judge] says that they should continue their deliberations, his statements are of no consequence.If two [of these judges] say, "There is a need to sit [further] to decide whether or not it is necessary to make [the year] full" and the other [judge] says that they should not continue their deliberations, we add two of the judges who had been invited previously, and the discussion of the matter [is continued].

שְׁנַיִם אוֹמְרִים צְרִיכָה עִבּוּר וּשְׁלֹשָׁה אוֹמְרִין אֵינָהּ צְרִיכָה. בָּטְלוּ שְׁנַיִם בְּמִעוּטָן. שְׁלֹשָׁה אוֹמְרִין צְרִיכָה עִבּוּר וּשְׁנַיִם אוֹמְרִין אֵינָהּ צְרִיכָה עִבּוּר. מוֹסִיפִין שְׁנַיִם מִן הַמְזֻמָּנִין לָהּ וְנוֹשְׂאִין וְנוֹתְנִין וְגוֹמְרִין בְּשִׁבְעָה. אִם גָּמְרוּ כֻּלָּם לְעַבֵּר אוֹ שֶׁלֹּא לְעַבֵּר עוֹשִׂין כְּמוֹ שֶׁגָּמְרוּ. וְאִם נֶחְלְקוּ הוֹלְכִים אַחַר הָרֹב בֵּין לְעַבֵּר בֵּין שֶׁלֹּא לְעַבֵּר. וְצָרִיךְ שֶׁיְּהֵא רֹאשׁ בֵּית דִּין הַגָּדוֹל שֶׁהוּא רֹאשׁ יְשִׁיבָה שֶׁל אֶחָד וְשִׁבְעִים מִכְּלַל הַשִּׁבְעָה. וְאִם גָּמְרוּ בִּשְׁלֹשָׁה לְעַבֵּר הֲרֵי זוֹ מְעֻבֶּרֶת וְהוּא שֶׁיְּהֵא הַנָּשִׂיא עִמָּהֶן אוֹ שֶׁיִּרְצֶה. וּבְעִבּוּר הַשָּׁנָה מַתְחִילִין מִן הַצַּד. וּלְקִדּוּשׁ הַחֹדֶשׁ מַתְחִילִין מִן הַגָּדוֹל:

Should two [judges] say that it is necessary to make [the year] full, and three say that there is no necessity, [the opinion of] the two is of no consequence. If three [judges] say that it is necessary to make [the year] full, and two say that there is no necessity, two more [judges] who were invited are added to the court, and the subject is debated.These seven [judges should] arrive at a conclusion. If they all agree to make the year full, or not to make the year full, their decision is followed. If there is a difference of opinion among them, we follow the majority, whether to make the year full, or not to make the year full.It is necessary that the head of the High Court - i.e., the one who presides over the seventy-one [judges of the Sanhedrin] - be one of these seven. If [the three original judges] conclude 10b). that it is necessary for the year to be made full, it should be made full, provided the nasi is among the three, or consents [to their ruling].Concerning the institution of a leap year, the opinions of the lesser judges should be offered first. Concerning the sanctification of the new month, we begin from the head of the court.

אֵין מוֹשִׁיבִין לְעִבּוּר הַשָּׁנָה לֹא מֶלֶךְ וְלֹא כֹּהֵן גָּדוֹל. מֶלֶךְ מִפְּנֵי חֵילוֹתָיו וּמִלְחֲמוֹתָיו שֶׁמָּא דַּעְתּוֹ נוֹטָה בִּשְׁבִילָן לְעַבֵּר אוֹ שֶׁלֹּא לְעַבֵּר. וְכֹהֵן גָּדוֹל מִפְּנֵי הַצִּנָּה שֶׁמָּא לֹא תִּהְיֶה דַּעְתּוֹ נוֹטָה לְעַבֵּר כְּדֵי שֶׁלֹּא יָבֹא תִּשְׁרֵי בִּימֵי הַקֹּר וְהוּא טוֹבֵל בְּיוֹם הַכִּפּוּרִים חָמֵשׁ טְבִילוֹת:

Neither a king 4:10. nor a High Priest should be [included in the group entrusted with deciding] whether or not to institute a leap year. A king [should not be included, lest he be influenced] by consideration for his soldiers and his wars. 18b) states that the king would pay his soldiers a yearly salary, and therefore, by instituting an extra month, he would gain.The B'nei Binyamin explains that there is also a reason for a king to desire to refrain from instituting an extra month. Bridegrooms, those who have built new homes, and those who have planted vineyards are freed from army service for a year. If a leap year is instituted, they benefit. Therefore, if a sizable portion of the population fell into these categories, and men were required for the army, it would be preferable for the king not to institute a leap year.A High Priest should not be included because of the cold - i.e., he may choose not to institute a leap year so that Tishrei will not fall in the winter, and he would [thereby not] have to immerse himself five times on Yom Kippur [in such weather].

הָיָה רֹאשׁ בֵּית דִּין הַגָּדוֹל וְהוּא הַנִּקְרָא נָשִׂיא בְּדֶרֶךְ רְחוֹקָה אֵין מְעַבְּרִין אוֹתָהּ אֶלָּא עַל תְּנַאי אִם יִרְצֶה הַנָּשִׂיא. בָּא וְרָצָה הֲרֵי זוֹ מְעֻבֶּרֶת. לֹא רָצָה אֵינָהּ מְעֻבֶּרֶת. וְאֵין מְעַבְּרִין אֶת הַשָּׁנָה אֶלָּא בְּאֶרֶץ יְהוּדָה שֶׁהַשְּׁכִינָה בְּתוֹכָהּ שֶׁנֶּאֱמַר (דברים יב ה) "לְשִׁכְנוֹ תִדְרְשׁוּ". וְאִם עִבְּרוּהָ בַּגָּלִיל מְעֻבֶּרֶת. וְאֵין מְעַבְּרִין אֶלָּא בַּיּוֹם. וְאִם עִבְּרוּהָ בַּלַּיְלָה אֵינָהּ מְעֻבֶּרֶת:

If the head of the High Court, the nasi, was on a distant journey, [the court] may institute a leap year only with the proviso that the nasi will consent. If the nasi comes and consents, the year is full. If he does not consent, it is not full.A leap year may be instituted only in the territory of Judea, for the resting place of the Divine Presence is there, as [implied by Deuteronomy 12:5]: "And you shall seek out his dwelling" If a leap year is instituted in the Galilee, the year remains full.A year should be made full only during the day. 11b states that there is an equation between the institution of a leap year and the sanctification of the new moon. As mentioned in Chapter 2, Halachah 8, the new moon can be sanctified only during the day.Based on the equation between these two practices, the Minchat Chinuch (Mitzvah 4) questions the law mentioned previously: Why may the moon be sanctified throughout Eretz Yisrael (Chapter 1, Halachah 8) if a leap year may be instituted only in the territory of Judea? If it is made full during the night, it is not full.

יֵשׁ לְבֵית דִּין לְחַשֵּׁב וְלִקְבֹּעַ וְלֵידַע אֵי זוֹ שָׁנָה תִּהְיֶה מְעֻבֶּרֶת בְּכָל עֵת שֶׁיִּרְצֶה אֲפִלּוּ לְכַמָּה שָׁנִים. אֲבָל אֵין אוֹמְרִין שָׁנָה פְּלוֹנִית מְעֻבֶּרֶת אֶלָּא אַחַר רֹאשׁ הַשָּׁנָה הוּא שֶׁאוֹמֵר שָׁנָה זוֹ מְעֻבֶּרֶת. וְדָבָר זֶה מִפְּנֵי הַדְּחָק אֲבָל שֶׁלֹּא בִּשְׁעַת הַדְּחָק אֵין מוֹדִיעִין שֶׁהִיא מְעֻבֶּרֶת אֶלָּא בַּאֲדָר הוּא שֶׁאוֹמֵר שָׁנָה זוֹ מְעֻבֶּרֶת וְחֹדֶשׁ הַבָּא אֵינוֹ נִיסָן אֶלָּא אֲדָר שֵׁנִי. אָמְרוּ לִפְנֵי רֹאשׁ הַשָּׁנָה שָׁנָה זוֹ שֶׁתִּכָּנֵס מְעֻבֶּרֶת אֵינָהּ מְעֻבֶּרֶת בַּאֲמִירָה זוֹ:

The court has the authority to calculate, institute, and decide which year(s) shall be full whenever it desires, even several years in advance. 12a relates that once, when Rabbi Akiva was imprisoned by the Romans, he instituted three leap years for the future. Nevertheless, a particular year is not declared a full year until after Rosh Hashanah, at which time a public statement [can be] made [to the effect that] the year has been made full. cites the fact that the year can be declared a leap year well in advance, as support for the Rambam's thesis (Halachah 2) that the fact that Pesach would be celebrated before the vernal equinox is, by itself, sufficient cause to declare a leap year. At the beginning of the year, it is impossible to know the state of the barley harvest, or the fruit trees.[A leap year is announced at such an early date] only in a pressing situation.) relates that this refers to a situation when it was feared that the Romans would prevent the leap year from being instituted if the court waited for the usual time.Note the Minchat Chinuch (Mitzvah 4), which explains that an early declaration should be made only in a pressing situation. The court may, however, calculate months and even years in advance, even in cases where the situation is not pressing. If the situation is not pressing, the announcement that a leap year has been instituted is not made until the month of Adar. [At that time, the court announces,] "This year is a leap year, and the following month is not Nisan, but rather the second Adar" If a court announces before Rosh HaShanah, "The year to come will be a leap year" this announcement does not make the year a leap year.

הִגִּיעַ יוֹם שְׁלֹשִׁים בַּאֲדָר וְלֹא עִבְּרוּ עֲדַיִן הַשָּׁנָה לֹא יְעַבְּרוּ אוֹתָהּ כְּלָל. שֶׁאוֹתוֹ הַיּוֹם רָאוּי לִהְיוֹת רֹאשׁ חֹדֶשׁ נִיסָן וּמִשֶּׁיִּכָּנֵס נִיסָן וְלֹא עִבְּרוּ אֵינָן יְכוֹלִים לְעַבֵּר. וְאִם עִבְּרוּהָ בְּיוֹם שְׁלֹשִׁים שֶׁל אֲדָר הֲרֵי זוֹ מְעֻבֶּרֶת. בָּאוּ עֵדִים אַחַר שֶׁעִבְּרוּ וְהֵעִידוּ עַל הַיָּרֵחַ הֲרֵי אֵלּוּ מְקַדְּשִׁין אֶת הַחֹדֶשׁ בְּיוֹם שְׁלֹשִׁים וְיִהְיֶה רֹאשׁ חֹדֶשׁ אֲדָר שֵׁנִי. וְאִלּוּ קִדְּשׁוּהוּ קֹדֶם שֶׁיְּעַבְּרוּ אֶת הַשָּׁנָה שׁוּב לֹא הָיוּ מְעַבְּרִין שֶׁאֵין מְעַבְּרִין בְּנִיסָן:

If the thirtieth day of Adar arrived without the year having been declared a leap year, it should never be made a leap year. 4:10 relates that declaring a leap year on this date was one of the three acts performed by King Chizkiyah that did not find favor in the eyes of the Sages. For that date is fit to be Rosh Chodesh Nisan, and once Nisan begins without the year having been declared a leap year, [the court] no longer has that option. If, however, they declared a leap year on the thirtieth of Adar, their ruling is binding.If witnesses came after the leap year had been declared and testified regarding [the sighting of] the moon, the court sanctifies the new month on the thirtieth day, and makes it the Rosh Chodesh of the second Adar. If they had sanctified the new month on the thirtieth day before they declared a leap year, they would not have been able to declare the leap year. For a leap year may not be declared in Nisan.

אֵין מְעַבְּרִין אֶת הַשָּׁנָה בִּשְׁנַת רְעָבוֹן שֶׁהַכּל רָצִים לְבַיִת הַגְּרָנוֹת לֶאֱכל וְלִחְיוֹת וְאִי אֶפְשָׁר לְהוֹסִיף לָהֶן זְמַן לֶאֱסֹר הֶחָדָשׁ. וְאֵין מְעַבְּרִין בִּשְׁבִיעִית שֶׁיַּד הַכּל שׁוֹלֶטֶת עַל הַסְּפִיחִין וְלֹא יִמְצְאוּ לְקַּרֵב הָעֹמֶר וּשְׁתֵּי הַלֶּחֶם. וּרְגִילִין הָיוּ לְעַבֵּר בְּעֶרֶב שְׁבִיעִית:

A leap year may not be declared in a year of famine 12a credits Elisha the prophet with the institution of this prohibition. when everyone is hurrying to the granaries to partake [of the new year's harvest] and derive vitality. [In such a situation,] it is impossible to prolong the time when the prohibition against eating from the new harvest [is in effect]. prevents one from partaking of grain from the new harvest until the offering of the omer of barley on the sixteenth of Nisan (Hilchot Ma'achalot Asurot 10:2-5). When the previous year has been plagued with famine, it is undesirable to keep this prohibition in effect any longer than necessary.We do not declare the Sabbatical year (loc. cit.), which forbids instituting a leap year only in the Sabbatical year. Another opinion forbids instituting a leap year in the year following the Sabbatical year. a leap year, because everyone is entitled to take the crops that grow on their own., which explains that according to the Torah, all agricultural labor is forbidden in the Sabbatical year. It is, nevertheless, permitted to take crops that grow from seeds strewn by the wind or that grow from other causes that did not result from conscious human labor. Although our Sages forbade benefitting from such crops for personal use, it was from these crops that the grain used for the omer offering and the two loaves of bread were harvested.The Sages forbade using these crops for personal use. Nevertheless, since the prohibition did not originate in the Torah, our Sages feared that it would not be observed by the common people and the crops would not remain for these sacrifices.Significantly, Rashi and others offer a second rationale for this practice, that our Sages did not want to prolong a year when it was forbidden to do agricultural work. Therefore, grain will not be available to offer the omer [of barley] and the two loaves of bread [offered on Shavuot]. must be from the harvest of the new year. It was customary to make the year preceding the Sabbatical year a leap year.).

יֵרָאֶה לִי שֶׁזֶּה שֶׁאָמְרוּ חֲכָמִים אֵין מְעַבְּרִין בִּשְׁנַת רְעָבוֹן וּבִשְׁבִיעִית. שֶׁלֹּא יְעַבְּרוּ בָּהֶם מִפְּנֵי צֹרֶךְ הַדְּרָכִים וְהַגְּשָׁרִים וְכַיּוֹצֵא בָּהֶם. אֲבָל אִם הָיְתָה הַשָּׁנָה רְאוּיָה לְהִתְעַבֵּר מִפְּנֵי הַתְּקוּפָה אוֹ מִפְּנֵי הָאָבִיב וּפֵרוֹת הָאִילָן מְעַבְּרִין לְעוֹלָם בְּכָל זְמַן:

It appears to me cites a passage (Sanhedrin 26a), which appears to indicate that it is impossible to declare a Sabbatical year a leap year. There are, however, other interpretations of that passage. (See Tosafot, loc. cit..) that our Sages' statement that a leap year should not be declared in a year of famine and in the Sabbatical year means that a leap year should not be declared because of the condition of the roads or the bridges, or because of factors of this nature. If, however, it is appropriate to declare a leap year because [Pesach will fall before] the vernal equinox, because [the barley has not] ripened, or because the fruit trees [have not bloomed], a leap year is declared always.

כְּשֶׁמְּעַבְּרִין בֵּית דִּין אֶת הַשָּׁנָה כּוֹתְבִין אִגְּרוֹת לְכָל הַמְּקוֹמוֹת הָרְחוֹקִים וּמוֹדִיעִים אוֹתָן שֶׁעִבְּרוּהָ וּמִפְּנֵי מָה עִבְּרוּ. וְעַל לְשׁוֹן הַנָּשִׂיא נִכְתָּבוֹת. וְאוֹמֵר לָהֶן יוֹדֵעַ לָכֶם שֶׁהִסְכַּמְתִּי אֲנִי וַחֲבֵרַי וְהוֹסַפְנוּ עַל שָׁנָה זוֹ כָּךְ וְכָךְ. רָצוּ תִּשְׁעָה וְעֶשְׂרִים יוֹם רָצוּ שְׁלֹשִׁים יוֹם. שֶׁחֹדֶשׁ הָעִבּוּר הָרְשׁוּת לְבֵית דִּין לְהוֹסִיפוֹ מָלֵא אוֹ חָסֵר לָאֲנָשִׁים הָרְחוֹקִים שֶׁמּוֹדִיעִין אוֹתָם. אֲבָל הֵם לְפִי הָרְאִיָּה הֵם עוֹשִׂים אִם מָלֵא אִם חָסֵר:

When the court institutes a leap year, they write a letter to all [the people in] distant places, notifying them that a leap year has been instituted, and the reason for which it was instituted.These letters were written in the name of the nasi. 11b, which relates that Rabban Gamliel sent letters to Jews throughout the diaspora notifying them of the declaration of a leap year. They would say, "Let it be known that I and my colleagues have agreed to add to this year this many days" - for it was possible for them to declare a month of twenty-nine days or a month of thirty days.[The intent is that] the court had the option of notifying the people in the outlying areas that the month would [probably] be either full or lacking. [In fact, however,] the determination of whether the month is full or lacking is dependent on the sighting of the moon.