the first day of every Jewish month; a minor holiday

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Are the calculations of the Molad mentioned by Ramba"m based on constant or variable (seasonal) figures?

Rambam KidushHachodesh 6:3 states: [the interval] between one conjunction of the moon and the sun and the subsequent conjunction according to their mean movement is twenty-nine full days, ...
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1answer
29 views

Why were leap years decided only by judges and not with the cooperation of witnesses?

Ramba"m Hilchot Kiddush Hachodesh 4:9 says: The year can be made full only by [judges] who were invited [to participate in the deliberations]. What is implied? The head of the High Court tells ...
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1answer
28 views

Why did the people have to respond twice “It is sanctified” when Sanhedrin declared Rosh Hodesh?

Ramba"m (Maimonedes) Hilchot Kid. Hachodesh 2:8 says: Afterwards - i.e., after [the witnesses'] testimony is substantiated - the head of the court declares, "It has been sanctified." And all the ...
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1answer
45 views

Why don't we say Hallel on Rosh Hashanah?

For most months, on the first day (Rosh Hodesh) we say the Hallel service between Shacharit and Mussaf. For the first day of Tishrei (Rosh Hashanah), however, we do not say Hallel. Why is it not ...
4
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1answer
34 views

How accurate is the Molad?

To the best of my knowledge the Molad is every 29.5 days + 793 Chalakim. Is there any information showing if the current Molad calculation is accurate scientifically? If it is off by how much is it ...
4
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3answers
233 views

Why is the day of Rosh Chodesh announced before every month except Tishrei?

Why is Tishrei the only month not included in the custom of announcing the day(s) of Rosh Chodesh on the Shabbos before the month begins?
2
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1answer
73 views

Is the distance for observing 2 days of Yom Tov today, the same distance as when this halacha was first instituted?

My understanding is that the reason for observing the 2nd Day of Yom Tov was that messengers were sent from the Sanhedrin to proclaim the day that Rosh Hodesh began, and they could reach only a ...
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1answer
57 views

When did Yom Kippur Kattan originate?

The day before Rosh Hodesh is considered like a "mini" Yom Kippur. (I understand that there are some months, I think before Tishrei and Nissan that do not have YKK? Correct me if I'm mistaken.) Some ...
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73 views

What do those people who wear tefillin all weekday do on Rosh Chodesh?

There are people who wear tefillin all day (see related question When did people stop wearing Tefilin all day? and the comments to it.) For one or two reasons many remove tefillin before Mussaf on ...
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1answer
38 views

Why don't we remember the Churban in Shabbat and Rosh Chodesh musaf?

The requirement to remember the churban is incumbent upon Jews every day (top of page 2) and is especially important at times of joy. Aside from the practices of leaving a wall unfinished/unpainted, ...
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17 views

Will 2 days of Rosh Hodesh & Yom Tov be necessary after Mashiach? [duplicate]

As I understand it, the origin for having a 2nd day of Rosh Hodesh & Yom Tov is that messengers were only able to travel a certain distance from where the Sanhedrin was to convey the declaration ...
2
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1answer
28 views

Mixing up the order of Retzei and Ya'aleh V'yavoh?

If someone is bentching on Shabbat-Rosh Chodesh, and accidentally skips Retzei, but says Ya'aleh V'yavoh, can they then say Retzei after Ya'aleh V'yavoh, but before Uvenei? Or must they continue and ...
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19 views

How can we make requests for personal needs in Rosh Chodesh “Bentching”? [duplicate]

On Shabbos before Rosh Chodesh we "Bentch" the new month between Shacharis and Mussaf. Seeing that it is Shabbos, when Chazal forbade one to ask for his personal needs how can we make these requests, ...
2
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1answer
69 views

How do you bench on a Friday rosh chodesh if you eat after kabbolas shabbos before nightfall

Do we say yaaleh v'yovo or r'tsai or both if one eats today which is Friday rosh chodesh after being mekabel shabbos but before nightfall. Does it make a difference if you finish before or after ...
4
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1answer
52 views

In the Rosh Chodesh leining, why is “Shabbas b'Shabato” pronounced with a pasach?

Recently, I paid attention to the Rosh Chodesh Torah reading (Bamidbar/Numbers Chapter 28) and noticed that in verse 10, "olas Shabbas b'Shabato…", the word "Shabbas" is vowelized with a pasach (short ...
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3answers
109 views

Why is so much importance attached to Mevarchim haChodesh (the blessing of the coming month)?

For example, in many shuls, there is a "Shabbos Mevarchim" kiddush, and I know of many people who try extra hard to be in shul that week (like it's parshas zachor or something). Is there any reason ...
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2answers
56 views

Why is Adar 1 30 days long?

The Talmud Ta'anit 6b says אין בין אדר הראשון לאדר השני אלא קריאת המגילה ומתנות לאביונים "There is no difference between the 1st Adar and 2nd Adar except for reading the Megillah and giving presents ...
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0answers
24 views

Recompense for taanis chalom on day with double keduasha

A person is permitted to perform a taanis chalom (fast for having a bad dream) on shabbos, but is supposed to fast a second time to compensate for having fasted on shabbos (Shulchan Aruch, Orach ...
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62 views

Mentioning our sins on Shabbos Rosh Chodesh

During every Shemoneh Esrei of mussaf, we pray that the Beis Hamikdash be rebuilt. However, only on Yom Tov do we mention that it was destroyed due to our sins - ומפני חטאינו. On Shabbos, and on Rosh ...
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1answer
134 views

When should one cut his nails for Shabbos when Friday is Rosh Chodesh

In the answer to Rules for Cutting Nails it quotes the Mishna Berura 260:6 that one should not cut their nails on Thursday. Mishna Berura explains that by cutting them on Thursday they will begin to ...
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1answer
63 views

When does the year start in terms of saying “Ulichaporas Pasha” for a leap year?

When we add the words "Ulichaporas Pasha" during Musaf of Rosh Chodesh when it's a leap year, when is the year determined - Nisan or Tishrei?
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74 views

Ulchaparat pasha in Chazarat haShatz

When "ulchaparat pasha" is said in the Chazarat haShatz of Rosh Chodesh, how should the amein of the tzibbur be handled? Should the amein from "velislichat avon" be deferred until after "pasha," or ...
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75 views

Not davening the musaf of Rosh Chodesh on Shabbos Rosh Chodesh

If someone by mistake didn't say atah y'ztarteh (the special tefillah we say by musaf on Shabbos that is also rosh chodesh) and instead davened a regular musaf on shabbos rosh chdoesh, what's the din ...
2
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1answer
41 views

Why is the rosh chodesh goat not in Rosh Hashana's section of Pin'chas?

Numbers 28 lists the musaf offerings of rosh chodesh. They include a goat, which is a chatas offering, and several animals as an ola offering. Numbers 29 lists the musaf offerings of Rosh Hashana. ...
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33 views

Lack of Benching Rosh Chodesh Tishrei [duplicate]

I have heard that the reason we do not Bench Rosh Chodesh Tishrei is in order to confuse the Satan. Now the Satan is no fool. How is the Satan getting confused when we pull this trick year after year? ...
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151 views

Shaving(hair cuts) on Rosh Chodesh

What is the reason that hair cuts are not allowed(or advisable) on Rosh Chodesh according to Rav Yehuda Hachassid? A lot of things mentioned in the tzavvah should be avoided because of danger is this ...
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45 views

Time limit on repeating the shemona esra after forgetting to include an insertion

If a person forgets to say yaaleh vyavo for rosh chodesh during the shemonah esre, I understand they are supposed to go back and repeat the shemonah esre, this time saying yaaleh vyavo. Is there a ...
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1answer
119 views

What is significant about being eight days old from birth?

We make a bris on the eighth day. A korban has to be eight days old before being brought on the mizbeach. The new moon according to many has to be eight days old from when its 'born' again till me ...
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2answers
125 views

Why do Israelis keep one day of Yom Tov?

From what I understand, we outside of Eretz Yisrael we keep two days of Yom Tov as a continuation of the minhag that evolved from the time of the Bais Hamikdash when we would not necessarily know when ...
3
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1answer
191 views

Forgot to say Yaaleh V'Yavo by Shacharis Rosh Chodesh - before the Molad

Orach Chaim 422:1 mentions that one who forgets Yaale V'Yavo at Maariv does not have to Daven again since we do not do Kiddush HaChodesh at night. However if one forgot at Shacharis or Mincha he does ...
5
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4answers
96 views

How to care about the molad

I have read the great answers to Purpose of announcing Molad and understood that the halakhic reason to know the molad is to know what the Sanhedrin would know when they declared a new month. But ...
6
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1answer
95 views

Mistake in aliyah on Rosh Chodesh

On Rosh Chodesh we have four aliyos by Krias HaTorah. Rosh Chodesh fell out on Monday and by mistake it was read by the first aliyah of Kohen the Parsha of that week. After the aliyah was finished ...
4
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4answers
177 views

Why are the commandments for Rosh Chodesh and Passover in the same paragraph?

The reading for Parashat Hachodesh consists of a single paragraph in the Torah, Exodus 12:1-20, whose main topic is God's commandments related to the Passover offering and holiday observance that ...
3
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1answer
251 views

New Moon Based on Sighting Outside of the Land of Israel

I would appreciate someone directing me to a source that states/indicates/suggests whether the visibility of the new moon outside the Land of Israel may be used to begin the Jewish month in that ...
6
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2answers
222 views

When do we start reciting Psalm 27?

Yesterday being the 30th of Av (and Rosh Chodesh Elul), prompted a question at shul: exactly when do we start saying Psalm 27—on the first day of Elul or the first day of Rosh Chodesh Elul? Most ...
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2answers
190 views

Rosh Chodesh Av versus the rest of the 9 days?

Is Rosh Chodesh Av any different than the rest of the nine days in terms of stringencies otherwise applicable during the nine days and the three weeks? For example, is there any heter to listen to ...
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1answer
87 views

Shir HaMa'aloth or 'Al Naharoth Bavel on Rosh Hodesh Av?

When Bentching on Rosh Hodesh Av, do you say Shir HaMa'aloth for Rosh Hodesh or 'Al Naharoth Bavel for the Nine Days?
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2answers
249 views

Cutting hair when Rosh Hodesh Av is a Friday

Is it permissible to cut hair on Rosh Hodesh Av when it comes out on a Friday?
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1answer
88 views

Posuk (Breishis 24:1) said after the end of Hallel on Rosh Chodesh

Artscroll Hebrew Siddurim - and 1 2 among others have at the end of Hallel to say the following Posuk. וְאַבְרָהָם זָקֵן בָּא בַּיָּמִים וַה' בֵּרַךְ אֶת-אַבְרָהָם בַּכֹּל Artscroll says it is a ...
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0answers
95 views

Why isn't Tefilat Mussaf consistent?

[Edit: According to Nusach Edot HamMizrach,] why does the Mussaf prayer on Shabbat and Rosh Chodesh include a description of the actual mussaf sacrifice, while the Mussaf prayer on Moed does not? Why ...
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1answer
59 views

Splitting up the rosh chodesh reading when another follows it

Shulchan Aruch, Orach Chayim 684:3 says (in my own translation): If rosh chodesh Teves comes out on Shabas, we remove three Torah scrolls, and six people read in the weekly section and one in that ...
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1answer
493 views

Shaving on Rosh Chodesh when it is Erev Shabbos

Is one who has the minhag of Reb Yehuda Hachassid to not shave or take a haircut on rosh chodesh (as outlined in his will) allowed to shave and or take haircuts when Rosh Chodesh comes out on Erev ...
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1answer
88 views

Forgiveness on Rosh Chodesh

If Rosh Chodesh is a "Zeman Kapara" (time of atonement) as we say in the Mussaf prayers, why does it contain no selichot and no tachanunim? Why doesn't it (the day of Rosh Chodesh itself) resemble Yom ...
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47 views

Why is the atonement for פשע limited to leap years in the Amida for Musaf Rosh Chodesh? [duplicate]

Possible Duplicate: Saying Ulichaporas Pasha in Musaf of Rosh Chodesh This question is a slightly different take on this one. I have posted a comment there and await to see if it needs to ...
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3answers
522 views

Why is Rosh Chodesh sometimes TWO days?

Why for certain months of the year do we celebrate the festival of Rosh Chodesh for two days while on other Roshei Chadashim we have one day of Rosh Chodesh?
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1answer
119 views

When to get an aliya for a Bar Mitzvah?

According to the new "Annotated Edition" of the Siddur Tehillas Hashem, a Bar Mitzvah bachur should get his first aliya either on Shabbos Mincha time, Monday, Thursday, or Rosh Chodesh. I assume that ...
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1answer
232 views

Shabbat Rosh Chodesh: Ata yatzarta

Why does the Shabbat Rosh Chodesh Musaf have its own special text (Ata Yatzarta Olamecha Mikedem ...) for the middle beracha?
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2answers
120 views

forgot birkas hachodesh

If a congregation forgot to say birkas hachodesh on the Shabas before rosh chodesh, should it say it another time? When? (Does it, perhaps, depend on what day(s) of the week rosh chodesh is?) Note: ...
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2answers
734 views

What are “Chukei Rosh Chodesh”?

In the Musaf of Rosh Chodesh, we mention that Hashem has given us "חוקי ראש חודש". What are these Chukim?
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1answer
115 views

Source for wearing special clothing on Rosh Chodesh

Is there a source for wearing somewhat festive clothes on Rosh Chodesh? I have seen some people who hold this custom.