1. Circular is not the same as spherical. The objects you are observing could be concave as well...

2. This is untrue, but popularly taught. It seems that the author of the legend of sleepy hollow is (at least partially) responsible for this myth. Virtually all educated people from, at least, ancient greece were taught the world was spherical from childhood - just like us today!

3. True. Some speculate disc, some concave (we live on the inside surface) - speculations abound!

If you have an interest in the subject (which it seems you do), please join us on the community i created to explore and discuss it further! Click my username and find the link, or let me know and i’ll pm it to you.

1. Circular is not the same as spherical. The objects you are observing could be concave as well...

2. This is untrue, but popularly taught. It seems that the author of the legend of sleepy hollow is (at least partially) responsible for this myth. Virtually all educated people from, at least, ancient greece where taught the world was spherical from childhood - just like us today!

3. True. Some speculate disc, some concave (we live on the inside surface) - speculations abound!

If you have an interest in the subject (which it seems you do), please join us on the community i created to explore and discuss it further! Click my username and find the link, or let me know and i’ll pm it to you.