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# Earth’s Orbit Definition

Earth's orbit is its path around the sun, completing a circle in 365.25 days. For example, the changing visibility of constellations throughout the year is due to Earth's orbit.

Grades 3-5 VideoEarth’s Orbit & Rotation
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## Earth’s Orbit & Rotation

### Fun Facts

• The heliocentric model of the solar system puts the Sun at the center and says that Earth orbit around the sun.
• Earth orbits around the sun at a different rate from other planets.
• We have leap years every 4 years because one orbit of the earth around the sun is 365.25 days.

### Why Do We Need To Know About Earth's Orbit

Learning about how the Earth moves around the sun helps us figure out why we can see different stars at different times of the year. This is really important for people who study the stars, weather, and farming because it helps them plan based on the environment.

The way Earth travels around the sun also helps us have calendars. This affects businesses and travel. Knowing about space movements is important for many jobs that needs to keep track of time and plans.

### Frequently Asked Questions

The shadow of a groundhog (or anything else) is determined by what?
The length of a shadow is determined by where the sun appears to be in the sky. If the sun is close to the horizon, a shadow will be long. If the sun is directly overhead, the shadow will be very short.
Why do we have a leap year in our calendar every four years?
Since it takes Earth 365.25 days to orbit the sun, but our normal calendar is 365 days, we add an extra day to our calendar every four years. (4 years x 0.25 day = 1 day added every 4 years.)
What is a geocentric view of the universe? What evidence showed us it is not correct?
A geocentric view of the universe is the idea that everything orbits around the Earth. Since the sun appears to move across the sky, it is easy to understand why humans believed this for a long time. A concept called stellar parallax provided evidence that we orbit the sun.
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