1. Two towns are on the same longitude. Town X is (50°N, 115°E) and town Y is 1800km directly south of X. find the position of Y (take p=22/7, R=6370km)
| State the longitude of Y |
| Y = |
| To find the distance along a great circle in km the distance= θ360 x 2 ΠR |
| = | θ | x | 2 | x | 22 | x | |
| 360 | 7 |
| Q= | ° |
| The latitude of Y = | - | 16.8 | = | N |
| Therefore the new position of town Y = | ° | N, | °E |