H. Rohmat


Traditionally, the first day of each month is the day
(beginning at sunset) of the first sighting of
the hilal (crescent moon) shortly after sunset. Beside
that, the astronomical new moon times and dates are
already computed exactly for thousands of years
backward and forward. Some nations have used the
lunar phase cycle as the basis for their calendars. In a
majority of Nadlatul Ulama (NU), oppose the use of
calculations, on the grounds that the latter would not
conform with Muhammad's recommendation to
observe the new moon of Ramadan and Shawwal in
order to determine the beginning of these months. This
Indonesia‟s largest Muslim organization, prefers to
utilize the method called imkanur rukyat, which requires
a clear, visible sighting of the moon. In the other side,
Muhammadiyah organization sets the first Ramdhan
based on mathematical and astronomical calculations
known as hisab wujudul hilal. This article focuses to
discuss further about how Muhammadiyah sets the first
day of Hijrah calendar.

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DOI: 10.24042/ijpmi.v7i1.921


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