Question

why do we have variation of Daylight in different parts of the world​

Answer 1

Answer:

Because of the Earth's tilt on its axis, the path of the Sun across the sky varies, and therefore, the rising and setting time changes. At different locations on Earth, the rising and setting times vary because the portion of the celestial sphere visible from different locations of Earth is different.

Answer 2

Answer:

Because of the Earth's tilt on its axis, the path of the Sun across the sky varies, and therefore, the rising and setting time changes. At different locations on Earth, the rising and setting times vary because the portion of the celestial sphere visible from different locations of Earth is different.