Cloud cover describes an impediment; not seeing the crescent is the observation outcome. Completing thirty days avoids basing the calendar on an unsupported presumption.
The distinction matters for the later testimony rule: an obstructed sky changes the kind of evidence that may suffice for confirming the Ramadan crescent.
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Kitab al-Sawm: Crescent Sighting and Establishing Ramadan
Cloud cover describes an impediment; not seeing the crescent is the observation outcome. Completing thirty days avoids basing the calendar on an unsupported presumption.
The distinction matters for the later testimony rule: an obstructed sky changes the kind of evidence that may suffice for confirming the Ramadan crescent.