>>519105242
The claim that the Moon’s diameter is 91 km, based on an animation and caption, is flawed and misrepresents astronomy to question the Moon landings. Here’s why:
Claim: The Moon’s orbital speed is 3,700 km/h, Earth’s rotation is 1,600 km/h, both east to west, so relative speed is 2,100 km/h. The Moon takes 2 min 36 sec (1/23 hr) to cross its diameter, so 2,100 ÷ 23 = 91 km diameter.
Errors:
Speeds & Directions: Moon’s orbital speed is ~3,683 km/h, but Earth rotates west to east (~1,670 km/h), not east to west. The Moon’s apparent westward motion is due to Earth’s rotation, not orbital speed. Subtracting velocities (3,700 - 1,600) is meaningless here.
Apparent Motion: The Moon’s sky motion (~15°/hr) is due to Earth’s rotation. The 2 min 36 sec claim for crossing its diameter (~0.5°) implies ~11.5 sec/°, far too fast (actual time: ~2 min for angular diameter).
Diameter Calculation: The Moon’s true diameter is ~3,474 km. The 91 km result comes from misapplying speeds and time. At ~384,400 km distance, the Moon’s angular size is ~0.5°, and Earth’s rotation causes the observed motion, not a tiny Moon.