How does the day and night occur?

Day and night occur because Earth rotates on its axis, causing different parts to face the Sun or turn away.

One day means the time the Earth takes to rotate once on its axis.This includes both day time and night time and it is approximately 24 hours.We get day and night because the Earth rotates on an its axis and during this rotation of 24 hours different parts of the planet are facing towards the Sun or away from it. Hence different parts of the world experiences day and night at the same time.Days are longer during summer and shorter during winter.

The Earth goes around the sun once every 365 days and at the same time rotates on its axis every 24 hours. Day and night are caused because of Earth’s rotation on its own axis.In this process Earth exposes all the sides of the globe to the sun.The side that is exposed to the sunlight experiences day and the other side which goes into the dark has night during the same time.One day is the time the Earth takes to rotate once on its axis and includes both day time and night . 

The day and night occurs due to the Earth's rotation. The day starts when the North Pole is facing toward the sun, and the night starts when it is facing away. This happens because of the axis of our planet's rotation. Some people call it "the wobble" because it actually takes nearly a year for us to travel one million miles but we only notice it in a day or two or three at most. It gives us around twenty four hours of light and twelve hours of dark as we spin around on our world, slowing down some over time as gravity pulls on us more than others while still carrying us with each orbit around our sun.