🔄Rotation vs Revolution🪐
Earth and other planets move in two ways at once. One motion gives us day and night; the other gives us the year.
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🔄Rotation
- ✓An object spinning around its own internal axis
- ✓Earth's rotation takes about 24 hours
- ✓Causes the cycle of day and night
- ✓Creates the apparent movement of the Sun across the sky
- ✓Also explains the bulge at a planet's equator
🪐Revolution
- ✓An object orbiting around another body
- ✓Earth's revolution around the Sun takes about 365 days
- ✓Defines the length of one year
- ✓Combined with axial tilt, it causes the seasons
- ✓Follows a roughly elliptical orbital path
Verdict
Rotation is the daily spin that brings day and night; revolution is the yearly orbit that brings the seasons. Earth does both simultaneously, which is why we have days, years and seasons.
Frequently asked
Which motion causes day and night?+
Rotation. As Earth spins on its axis, each side faces the Sun in turn.
What causes the seasons?+
Earth's revolution around the Sun combined with the tilt of its axis.
How long is one Earth revolution?+
About 365.25 days, which is why we add a leap day every four years.
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