0 complete circles. He realized that if he knew the distance from Alexandria to Sion, he could easily calculate the circumference of the Earth.

When was the first time humans saw Earth from space?

It’s been 50 years since the Apollo 11 mission brought three astronauts — Neil Armstrong, Buzz Aldrin, and Michael Collins — to the moon and back.superior July 16, 1969On launch day, the Apollo 11 crew became the first people to look down at Earth from space.