Blessing the New Moon: 10 Halachot of Birkat HaLevanah

Each month, the moon appears to renew itself, beginning a new cycle and gradually increasing in light. In recognition of this renewal, our sages instituted Birkat HaLevanah, the blessing over the new moon.

This special mitzvah is an opportunity to praise Hashem for the constant renewal of creation. When should Birkat HaLevanah be recited, what happens if the moon is covered by clouds, and can it be said on Shabbat? Here are some important halachot to know.

The blessing includes the words: "Blessed are You, Hashem, our God, King of the Universe, who by His word created the heavens..." and concludes, "Blessed are You, Hashem, who renews the months."

What If the Moon Is Covered by Clouds?

Birkat HaLevanah should be recited when the moon is shining and its light can be enjoyed. If thick clouds completely cover the moon and obscure its light, the blessing should not be recited.

If someone has already begun the blessing and clouds suddenly cover the moon, the blessing should be completed. However, if clouds are approaching and the blessing has not yet been started, it is preferable to wait until the sky clears.

If only a thin cloud covers the moon and its light remains clearly visible, the blessing may be recited. Some prefer to wait until the moon is completely unobstructed. However, if only a couple of days remain before the deadline for Birkat HaLevanah, one may recite the blessing through a thin cloud rather than risk missing the mitzvah entirely.

If a congregation is reciting Birkat HaLevanah while the moon is covered by a thin cloud, someone who is hesitant because of the cloud but fears losing the opportunity may intend to fulfill the mitzvah conditionally. If he later sees the moon unobstructed, he can recite the blessing then. If not, he can rely on his original recitation.

When Should Birkat HaLevanah Be Recited?

The Sephardic custom, in accordance with Kabbalah, is to wait seven full days after the new moon before reciting Birkat HaLevanah.

In places where cloudy winter weather creates a real possibility of missing the blessing altogether, it is permissible to recite it after three days.

The Maggid revealed to Rabbi Yosef Karo that reciting the blessing before seven days could allow external forces to attach themselves to it. Waiting seven days therefore serves to prevent the sacred from becoming mixed with the mundane.

The Shulchan Aruch recommends reciting Birkat HaLevanah on Saturday night, when a person is well dressed and fragrant. Ideally, it is recited after Maariv together with the congregation.

However, this preference should not cause someone to miss the mitzvah. During winter, when there is a concern that clouds may later obscure the moon, Birkat HaLevanah should be recited at the first suitable opportunity.

Ideally, one should not unnecessarily delay fulfilling the mitzvah, since those who are eager to perform mitzvot do so promptly.

Birkat HaLevanah may be recited until the night of the fifteenth day of the Jewish month, since the blessing relates to the moon's renewal. After that point, when the moon begins to wane, the blessing should no longer be recited.

Can Birkat HaLevanah Be Recited at Twilight or on Shabbat?

Normally, Birkat HaLevanah is recited after nightfall, when the stars are visible.

However, when there has been persistent cloud cover and the moon becomes visible during twilight, there are circumstances in which the blessing may be recited then rather than risk losing the opportunity altogether.

Similarly, Birkat HaLevanah is generally not recited on Shabbat or holiday evenings. During the winter, however, if the moon becomes visible on Shabbat or a holiday night and there is a genuine concern that it will be obscured afterward, the blessing may be recited. Renowned Torah sages have followed this practice when necessary.

Who Can Recite Birkat HaLevanah?

A blind person does not recite Birkat HaLevanah independently, but may fulfill the obligation by hearing the blessing from someone else.

Similarly, a person who is unable to speak can fulfill the obligation by listening to another person's blessing, just as one can fulfill certain other obligations through listening, such as Kiddush on Shabbat or the reading of the Megillah.

Traditionally, women do not recite Birkat HaLevanah. They may, however, listen to the blessing recited by a man and fulfill the obligation in that way.

A person during the initial seven days of mourning generally refrains from Birkat HaLevanah because the blessing is meant to be recited with joy. However, if the mourning period will end only after the deadline for the blessing, or if weather conditions create a genuine risk of missing the mitzvah, there are circumstances in which it may be recited.

Birkat HaLevanah transforms the simple sight of the moon into an opportunity to recognize Hashem's creation and its constant renewal. Whether waiting for clouds to clear or stepping outside on a Saturday night with the congregation, the blessing reminds us to pause each month and acknowledge the One who "renews the months."