The sextant measures angles on a plane, the angular size of the Sun is 32 minutes and the definition of a mile is 1 minute. This is not proof that can be refuted by an inconclusive youtube video of a rusty ship wreck, it's direct measurement.
You don't understand how the sextant works.
To you, everything in the sky is xx miles wide - even though a "mile" is a made up human measurement.
(posting a prepared image shows you will believe in anything someone tells you - just like a religious person)
''minutes and the definition of a mile is 1 minute.'' What?
"A nautical mile is a unit of measurement defined as exactly 1,852 metres (6,076.1 ft; 1.1508 mi). Historically, it was defined as one minute of latitude, which is one sixtieth of a degree of latitude. Today, it is a non-SI unit[1] which has a continued use in both air and marine navigation,[2] and for the definition of territorial waters.[3]" -- https://en.wikipedia.org/wiki/Nautical_mile
You guys keep confusing/conflating apparent size with angular size. Angular size corresponds a physical distance and apparent size is just how big an object looks. Either understand and acknowledge difference or you need to consider suicide.
The following illistration is not to scale and the drawn angle is distorted by perspective but it's simplicity helps demonstrate the concept of angular size. It doesn't matter where a telephone pole is located within the field of view so long as it hasn't passed the vanishing point its angle will remain the same size. If the height of a pole is changed its angle will also change to mach the new height. This is how distance is measured and it's how a mile is defined by an angle of one minute.
Angular size is something that can't be measured on a globe, the horizon on a globe while standing by the ocean is a curved line formed by a convex dome of water three miles away. Ships on a globe sail up, over and disappear behind the curve of the dome as they sail down below the water blocking the view. There is no vanishing point to measure angular size with, everything is hidden by curvature before that can happen. If you believe this then kill yourself.
The angle measured between two sides of the Sun and the horizon vanishing point reveals the diameter of the Sun in miles. The sextant measures angles on plane and the Sun is measured at 32'; the application and direct measument is irrifutible proof beyond a reasonable doubt the Earth is flat.