What is a Year?

In science, a year is the time it takes for a planet to complete one orbit around its star. On Earth, a year is approximately 365.25 days long. This is the time it takes for the Earth to complete one full orbit around the Sun.

Study Guide:

1. Definition: Define a year as the time it takes for a planet to complete one orbit around its star.
2. Earth's Year: Explain that on Earth, a year is approximately 365.25 days long due to its orbit around the Sun.
3. Seasons: Describe how the Earth's orbit and tilt cause the changing of seasons.
4. Leap Year: Discuss the concept of a leap year and why it is necessary to account for the extra 0.25 days in Earth's orbit.
5. Other Planets: Explore how the length of a year varies on other planets in our solar system.