What phenomenon is caused by the tilt of Earth's axis as it orbits the Sun?

• A. Lunar Eclipse
• B. Solar Eclipse
• C. Seasons
• D. Phases of the Moon

Answer: (C)

Seasons come from the tilt of Earth's axis as it orbits the Sun. Because the axis is tilted about 23.5 degrees, different hemispheres are tilted toward or away from the Sun at different times of the year. When a hemisphere tilts toward the Sun, sunlight hits more directly and days are longer, producing summer. When it tilts away, sunlight is less direct and days are shorter, producing winter. The intermediate times create spring and fall as the Sun’s path across the sky shifts north and south. The tilt is the primary reason for the seasonal changes, with only a small effect from the Earth’s slightly varying distance from the Sun.

Lunar and solar eclipses are separate events that happen when the Sun, Moon, and Earth align in particular ways, not because of the tilt. Phases of the Moon come from the Moon’s position relative to the Sun as seen from Earth, independently of the tilt.