Yeah. If anything rises "perfectly straight up in the sky" and "hovers" (assuming by "hover" we mean "fly without moving" as is the common usage of the word), then whenever it lands, no matter how much later in the future, it will be at the same spot it took off at. I'm not sure what the point of the comment is, these are just the definitions of words.

Also, if you take off and fly straight north at 500 miles per hour for one hour and then land, you will be 500 miles north of your starting point (assuming you started more than 500 miles away from the north pole). Also just definitions.

Yeah. If anything rises "perfectly straight up in the sky" and "hovers" (assuming by "hover" we mean "fly without moving" as is the common usage of the word), then whenever you land, no matter how much later in the future, you will be at the same spot you took off at. I'm not sure what the point of the comment is, these are just the definitions of words.

Also, if you take off and fly straight north at 500 miles per hour for one hour and then land, you will be 500 miles north of your starting point (assuming you started more than 500 miles away from the north pole). Also just definitions.

Yeah. If anything raises "perfectly straight up in the sky" and "hovers" (assuming by "hover" we mean "fly without moving" as is the common usage of the word), then whenever you land, no matter how much later in the future, you will be at the same spot you took off at. I'm not sure what the point of the comment is, these are just the definitions of words.

Also, if you take off and fly straight north at 500 miles per hour for one hour and then land, you will be 500 miles north of your starting point (assuming you started more than 500 miles away from the north pole). Also just definitions.