Posted: 5/25/2008 4:30:51 PM EDT
| The Phoenix spacecraft travelled 423 million miles to a landing zone that is 12 x 44 miles. At that range, 12 miles is 2.84e-8 radians, or about 0.0001 arc minutes. And, Mars is orbiting the Sun at a mean velocity of 24.13 KM / Sec. That makes .5 arc minutes at 100 yards for a stationary target sound pretty easy. |
