| Answer | Crossword Clue |
|---|---|
| ENOS | Only ape to circle the earth |
| ENOS | Only ape to orbit the earth (1961) |
| GLENN | First U.S. astronaut to circle the earth |
| deferent | (in the Ptolemaic system) the circle around the earth in which a celestial body or the center of the epicycle of its orbit was thought to move |
| horizons | A great circle of the celestial sphere, the plane of which passes through the center of the earth and is parallel to that of the apparent horizon of a place |
