Who is the 1st person that discovered the earth?
No one "discovered" the Earth, but among the first to map both hemispheres was Amerigo Vespucci (1454- 1512) an Italian cartographer, from whose name "America" was derived. The first Europeans to circumnavigate the Earth were on the crew of Ferdinand Magellan (1480-1521), a Portugese explorer who died during the voyage.
Obviously, meteroids weren't discovered until a person was alive. This person was a person from Canada in 1567. His name is Jefferson Morris. He did not know what it was and so he went down and researched about that and after 7 years of research. He discovered it was a meteoroid. In 1789, another person from Japan said it was a meteorite because it had already fallen to the Earth. His name was Yokoheno Toyoko.