What Causes The Different Phases Of The Moon

It is a common misconception that the earth s shadow causes the phases of the moon but that s totally wrong.

What causes moon phases. You ve probably noticed that the moon seems to change shape over time. Every month as the moon cycles through its phases it appears to change shape. Here are just some of the main ones.

This phase occurs when the moon is situated directly between the sun and the earth. There are common misconceptions around what causes the phases of the moon. The moon always has the same spherical shape but stargazers on earth see different fractions of the dark and illuminated portions of the moon as the moon orbits earth the common urban myth that earth s shadow falling on the moon causes lunar phases is incorrect. When the angle of sunlight reflecting off the moon changes humans observe different lighting levels from the moon.

This is because the sun only lights up one side of the moon the other side is dark. Just like the earth the moon is only half lit by the sun at any time. Phases occur as the earth facing side of the moon changes over the course of 29 5 days when the moon revolves around the planet. The earth s shadow is what causes a lunar eclipse.

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When half the side of the moon facing earth is lit up the phases are called the first and third quarters. The moon s shape resembles a crescent and increases in size each day. We see it from different angles that s how moon phases occur. When the surface of the side of the moon facing earth is completely illuminated we see a full moon.

As the moon orbits the earth different parts of it are lit which is why it seems to change shape. No the phases of the moon are caused by the sun s light hitting the moon at different angles when viewed from earth. A solar eclipse can only occur during this phase. A crescent shaped moon appears directly after the first lunar phase.

Brought to you by sciencing. The earth blocks the light that comes from the sun the crescents are caused by shadows of the earth from the sun onto the moon. Lunar phases on the other hand are caused by the position of the moon in relation to the sun.