Answer:
Earth revolving once around the Sun
Step-by-step explanation:
The Earth is one of the planets that make up the Solar system. The earth undergoes two phenomena called "ROTATION" and "REVOLUTION". Rotation refers to the moving around of an object along its own axis while revolution refers to the moving of an object around another object.
The Earth rotates (along its axis) to produce the day and night (24 hours). However, the revolution of the Earth around the largest planetary body, which is the SUN, takes approximately 365 days to complete. Hence, the Earth's revolution around the sun produces the year (365 days).