| Answer | Crossword Clue |
|---|---|
| EQUATOR | A Great Circle. |
| EQUATOR | Great circle |
| AIKEN | "Great Circle" writer Conrad |
| COLURE | Great circle of the celestial sphere |
| AIRLINE | Great-circle route between two places. |
| SEAMILES | Lengths of minutes of the earth's great circle. |
| MERIDIAN | Great circle that passes through the Earth's poles |
