Question

1. the diagram below represents earth as viewed from space. letter a represents the angle of tilt of earths rotational axis. line xy is perpendicular to the plane of earths orbit.

to polaris
what is the value of the angle represented by letter a?
(1) 23.4° (2) 15.0° (3) 6.68° (4) 177.4°

1. base your answer to the following question on the diagram below and on your knowledge of earth science. the diagram represents the apparent change in direction of the swing of a scientific device over a period of five hours. this device provides evidence of earths rotation.

approximately how many degrees does earth rotate on its axis over this five - hour period?
(1) 75° (2) 15° (3) 45° (4) 90°

Explanation:

1. Earth's axis is tilted at approximately 23.5° relative to the perpendicular of its orbital plane, which matches option (1).
2. Earth rotates 360° in 24 hours, so per hour it rotates 15°. In 5 hours, rotation = 5×15° = 75°, matching option (1).

Answer:

1. (1) 23.49°
2. (1) 75°