Day and Night:

Day and Night:

Earth's rotation on its axis causes day and night.

As Earth spins, sunlight only falls on one-half of the planet. This means it is daytime on that side of Earth. On the other side, it is night. This way we have Day and Night.

The apparent movement of the Sun across the sky is actually due to the rotation of our Earth. The Sun always appears to rise in the east and set in the west regardless of where you are on Earth.

When the Sun rises, that part of the Earth is turning to face the Sun. When the Sun sets, that part of the Earth is turning away from the Sun. The Sun itself doesn't actually rise or set. Each planet spins around or rotates on its axis.

Earth spins around at a speed of 1 600 km/h. Earth takes almost 24 hours to complete one rotation around the Sun. Because each rotation takes slightly less than 24 hours the calendar needed adjusting. Leap years add an extra day, the 29th February, to the calendar every four years so that the calendar aligns with Earth's motion around the Sun.

Moon Phases :

We see the Moon because sunlight is reflected from its surface. As the Moon orbits Earth and as Earth orbits the Sun, we see different amounts of the Moon's sunlit face. These are known as the phases of the Moon.

New Moon : The Moon in between Earth and The Sun and The Moon’s unlit side is facing Earth.

Waxing Moon : Less than one-half of the Moon is lit by direct sunlight.

First Quarter : One-half of the Moon is lit by direct sunlight.

Waxing Gibbous : More than one-half of the Moon is lit by direct sunlight.

Full Moon : Two weeks after the New Moon, the Moon os halfway through its orbit. The Moon’s sunlit side is looking Earth.

Waning Gibbous : More than one-half of the Moon is lit by direct sunlight.

Last Quarter : One-half of the Moon is lit by direct sunlight.

Waning Crescent : Less than one-half of the Moon is lit by direct sunlight.