Problem 25
Explain why Earth's magnetic north poles must be mapped and why these maps must be kept up-to-date.
Problem 27
Orbital Tilt The Moon's orbit is tilted at an angle of \(5^{\circ}\) to Earth's orbit around the sun. Using a protractor, draw the Moon's orbit around Earth. What fraction of a full circle \(\left(360^{\circ}\right)\) is \(5^{\circ}\) ?
Problem 29
Spacecraft Velocity The Lunar Prospector spacecraft shown above took 105 hours to reach the Moon. Assuming that the average distance from Earth to Moon is \(384,000 \mathrm{~km}\), calculate its average velocity on the trip.
