- Earth is a kind of planet
- The sun is a kind of star
- The earth revolves around the sun
- So, earth revolving the sun is an example of a planet revolving around its star

- Earth revolving the sun is an example of a planet revolving around its star
- A complete revolution / orbit of a planet around its star takes 1 / one planetary year
- Therefore, a complete revolution of earth around the sun takes an earth year

So, a complete revolution of earth around the sun takes an earth year
[Question]Earth makes a complete revolution around the Sun about once every
[Context]- Earth is a kind of planet 
- The sun is a kind of star 
- The earth revolves around the sun 
- A complete revolution / orbit of a planet around its star takes 1 / one planetary year