Which factor causes days/times on planets to differ?

Which factor causes days/times on planets to differ?

• A. Time It Takes for Planets to Revolve Around the Sun
• B. Time It Takes for Planets to Rotate
• C. Axis Tilt
• D. Position in Relation to the Sun

Answer: (C)

The key idea is that the length of a planet’s day is determined by how long it takes to complete one spin on its axis. If a planet rotates quickly, its day is short; if it spins slowly, its day is long. That rotation period—how long one full rotation takes—sets the length of the day and the rhythm of sunrise and sunset. For example, Earth completes a rotation in about 24 hours, while Jupiter spins in roughly 10 hours and Venus rotates very slowly, taking about 243 Earth days for a single rotation (and in the opposite direction). Axis tilt, while it shapes seasons and how sunlight is distributed across the year, does not change the length of the day itself. It affects how long daylight lasts at different times of year and at different latitudes, but the fundamental day length comes from the rotation rate. The time it takes to orbit the Sun determines the length of the year, and where a planet sits in its orbit influences insolation, not the day’s duration.

The key idea is that the length of a planet’s day is determined by how long it takes to complete one spin on its axis. If a planet rotates quickly, its day is short; if it spins slowly, its day is long. That rotation period—how long one full rotation takes—sets the length of the day and the rhythm of sunrise and sunset. For example, Earth completes a rotation in about 24 hours, while Jupiter spins in roughly 10 hours and Venus rotates very slowly, taking about 243 Earth days for a single rotation (and in the opposite direction).

Axis tilt, while it shapes seasons and how sunlight is distributed across the year, does not change the length of the day itself. It affects how long daylight lasts at different times of year and at different latitudes, but the fundamental day length comes from the rotation rate. The time it takes to orbit the Sun determines the length of the year, and where a planet sits in its orbit influences insolation, not the day’s duration.