by jimwalton » Mon Oct 26, 2020 6:02 pm
1. When a ship sails toward the horizon, it doesn't just get smaller. Instead, it disappears from low to high, hull to mast, with the mast being the last part to disappear. It shows that the Earth is curving not just on a flat disk, but in every direction away from the object.
2. Astronomy. Different constellations are visible at different latitudes. The Big Dipper is visible only in the north; the Southern Cross only in the south. If the Earth were a disk as opposed to a sphere, this would not be the case. If the Earth were flat, all constellations would be visible to all just the same.
3. Lunar eclipses. Since a lunar eclipse can be viewed from many points of observation on the Earth, and since the moon is in different latitudinal positions in different eclipses, it's possible to see that the shadow on the moon is consistent no matter what one's viewing position is, proving that the Earth is a sphere, not a disk.
4. Climb a tree or a mountain. If the Earth were flat, visibility would be just as far no matter what one's vantage point. If the Earth is spherical, however, one could see further with a higher view, which is the case. Even your own weather balloon with a camera attached will show you this phenomenon.
5. A simple airplane flight around the world will suffice. NASA pics are not necessary. I have flown to Europe and Asia. The Earth is the same shape no matter what. If the Earth were flat, anyone in an airplane with enough distance could discover its disk shape. That, however, is not the case. It's always a sphere.
6. Shadows. On the day of summer solstice (about a week ago), at high noon, a place directly under the sun casts no shadows. A place relatively close (a couple of hundred miles) does. If the Earth were flat, both places would cast no shadow because the sun's position would be the same relative to the ground. But since they are not the same, it shows that the ground is falling away in an arc, showing the Earth to be a sphere and not a disk.
Last bumped by Anonymous on Mon Oct 26, 2020 6:02 pm.