The Ten Days of Repentance are in the month Tishrei in the
Hebrew calender, and usually takes place in September.
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The Ten Days of Repentance, from Rosh Hashanah until Yom
Kippur.
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Rosh Hashanah is on Rosh Chodesh. What you mean to ask is, What are the days between Rosh Hashanah and Yom Kippur. These are the Aseret Yemai Teshuvah, the Ten Days of Repentance.
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all days have been made specific for prayers. Muslims have been
obliged to pray five times a day.However prayers on the night of 15
shauban and all month of ramzan specially the last ten days are of
great importance for repentance.