فإن لم يكن في السماء علة لم تقبل الشهادة حتى يراه جمع كثير
Translation: If the sky has no obstruction, testimony is not accepted until a large group has seen the crescent.
Under a clear sky with no material viewing impediment, Quduri does not treat an isolated sighting as sufficient for a public determination. Instead, a substantial group must have sighted the crescent.
This is an evidentiary distinction: a clear horizon allows broader observation, while obstruction explains why most people did not see the crescent. The strength of evidence required therefore differs.