Suppose dense clouds cover the sky on the relevant evening. Two legally qualified male witnesses testify to having seen the Shawwal crescent. Their configuration matches one of the two listed in Quduri.
A single witness, even strongly convinced, does not satisfy that listed Shawwal configuration.
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Kitab al-Sawm: Eid Crescent Sighting and Testimony
Suppose dense clouds cover the sky on the relevant evening. Two legally qualified male witnesses testify to having seen the Shawwal crescent. Their configuration matches one of the two listed in Quduri.
A single witness, even strongly convinced, does not satisfy that listed Shawwal configuration.