The Sun lights up half of the Earth, and the other half is in darkness. As the Earth spins we move from darkness to light and back to darknes and so on. It is daytime in Pakistan when our part of the planet is lit by the Sun. And it is night-time in the Pakistan when our part of the planet is facing away from the Sun
The planets spin as they orbit the Sun. It takes the Earth 24 hours to make one complete turn on its axis, so an Earth day is 24 hours long
During the day, the Sun appears to move through the sky. This happens because the Earth is spinning on its axis
During the night, we cannot see the Sun. But the Earth is still spinning on its axis. This means that the stars appear to move from east to west in the sky, just as the Sun does in the day
Remember that we can only see the part of the Moon that reflects the Sun's light. How much of that we can see depends upon the position of the Moon in its orbit
