The Earth orbits the Sun and rotates on its axis. What causes day and night?

The Earth orbits the Sun and rotates on its axis. What causes day and night?

• A. The orbit around the Sun
• B. The rotation of the Earth
• C. The tilt of Earth's axis
• D. The Moon's phases

Answer: (B)

Day and night happen because the Earth spins on its axis. As the planet rotates, different parts of its surface move into and out of the Sun’s light. When your location is facing the Sun, it’s daytime; when it’s turned away, it’s nighttime. The moving line between day and night, called the terminator, sweeps across the globe with each rotation, producing a regular 24-hour cycle. The Earth's orbit around the Sun mainly affects seasons and the length of days at different times of the year, not the daily switch between day and night. The tilt of Earth’s axis influences how long daylight lasts seasonally but isn’t the immediate cause of day and night. The Moon’s phases relate to the Moon’s position relative to Earth and the Sun and don’t drive day and night.

Day and night happen because the Earth spins on its axis. As the planet rotates, different parts of its surface move into and out of the Sun’s light. When your location is facing the Sun, it’s daytime; when it’s turned away, it’s nighttime. The moving line between day and night, called the terminator, sweeps across the globe with each rotation, producing a regular 24-hour cycle.

The Earth's orbit around the Sun mainly affects seasons and the length of days at different times of the year, not the daily switch between day and night. The tilt of Earth’s axis influences how long daylight lasts seasonally but isn’t the immediate cause of day and night. The Moon’s phases relate to the Moon’s position relative to Earth and the Sun and don’t drive day and night.