The different phases of the moon

Moon is our closest neighbour and Earth’s only natural satellite. Moon does not have its own light. It reflects the sunlight that falls on it. We see different phases of the Moon i.e., sometimes we see a full moon, sometimes a half, gibbous or a crescent and sometimes we don’t see it at all. In this article, we will discuss the different phases of the moon, and the reason why the moon has phases?

Why the moon has phases?

Moon orbits around the Earth in a prograde motion and is tidally locked with the Earth. It means the same side of the Moon faces the Earth all the time. As the moon revolves around the Earth, the side facing the Earth is differently lit from 0% to 100% by the sunlight. We only see that much part of the moon which is lit and is reflecting sunlight to Earth.

Phases of the moon

New moon

During the new moon phase, we can not see the moon in the sky with naked eyes. The moon is between the Sun and the Earth. The side of the moon facing the Earth is in complete darkness while the side facing the Sun is completely lit.

A solar eclipse will occur during a new moon phase when Sun, Moon, and Earth are aligned in a straight or near straight line.

Waxing crescent

After the new moon phase, the moon is visible as a crescent which increases in size day by day. The moon is known as waxing crescent until it is half illuminated.

First quarter

During this phase, the Moon is 50% illuminated.

Waxing gibbous

The moon after the first quarter until the full moon is known as waxing gibbous. Waxing means getting bigger and gibbous means convex. In this phase moon is 51-99 percent illuminated.

Moon Phases
Moon Phases

Full moon

Full moon occurs when the side of the moon facing the Earth is entirely lit. This complete illumination occurs when the moon is on the opposite side of the Earth from the Sun. The entire hemisphere facing the Earth receives sunlight which is reflected back to the Earth.

During a full moon, if the Sun, Earth and Moon are exactly or nearly aligned in a straight line, a lunar eclipse will take place.

Waning gibbous

After the full moon phase, moon size starts decreasing. The moon is known as waning gibbous till its illumination decreases to 50 percent.

Third quarter

The moon is 50 % illuminated during this phase. During the third quarter phase, the opposite half of the moon is illuminated as compared to first quarter.

Waning crescent

After the third quarter, moon again is visible as a crescent till it disappears from the night sky and enters the new moon phase.


Quick question

Moon is the _ _ _ _ _ largest natural satellite in our solar system.


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Answer to quick question

Moon is the fifth-largest natural satellites in our solar system.

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