On the question of differing horizons
Under this heading the author lists three views:
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The position of the majority is that variation in horizons carries no legal weight, citing the general wording of the Prophet’s ﷺ statement: ṣūmū li-ru’yatihi wa-afṭirū li-ru’yatihi (Fast when you see it and break the fast when you see it). The report is agreed upon and is recorded in Irwāʾ al-Ghalīl, no. 902, through several chains from Abū Hurayrah and others.
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Each country relies on its own sighting and is not bound by the sighting of another country; they support this with the ḥadīth of Ibn ʿAbbās found in Muslim and elsewhere.
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Obligation rests upon the inhabitants of the land where the sighting occurs, together with those regions that lie on the same alignment.
The author chooses this last view and comments on it, saying: