The Hijri Calendar is a lunar one, meaning that months begin when the first crescent of a new moon is sighted.
And since this type of calendars is 11 to 12 days shorter than the solar year, Rabi’ At-thani and all Hijri months migrate throughout the seasons.
The Astronomical New Moon (conjunction) is on November 15, 2020 (Sunday) at 5:07 UT.
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On Sunday, the moon can be seen with difficulty in Western South America, and easily in Polynesian Islands. On November 16, the moon can be seen in almost the whole world (See visibility curves).
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The entire world will easily see the newborn crescent of the month Rabi’ At-thani on Monday, November 16.
This means that Monday is considered to be the beginning of Rabi’ At-thani, the fourth month on the Islamic calendar.
May Allah bless all your days and months.
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