The Ruling on Fasting and Breaking the Fast Based on Astronomical Calculations
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Question:
The questioner asks: Is it permissible to fast and break the fast based on astronomical calculations?
Answer:
This is not permissible. Because the Prophet (peace and blessings be upon him) said:Sahih Muslim 1081b meaning the crescent moon. Muwatta Malik 18:1 meaning it did not appear due to clouds and darkness, so complete the count of thirty days. So we do not fast or break the fast except by one of two things: either by seeing the crescent moon, or by completing the count of thirty days. As for calculations, they are not considered in the obligation of fasting or in any other of the rulings of the Shari'ah. Yes.
The questioner asks: Is it permissible to fast and break the fast based on astronomical calculations?
Answer:
This is not permissible. Because the Prophet (peace and blessings be upon him) said:
Observe fast on sighting it (the new moon) and break (fast) on sighting it (the new moon)
صوموا لرؤيته وأفطروا لرؤيتهDo not begin the fast until you see the new moon, and do not break the fast (at the end of Ramadan) until you see it. If the new moon is obscured
لا تصوموا حتى تروا الهلال ولا تفطروا حتى تروه فإن غم عليكم
Source
مجالس رمضان 1431هـ - 07 — alfawzan.live (26:43)
The Arabic text is a machine transcription of the audio recording.