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Because the earth blocks you from seeing the full circle. You can use a misting garden hose to make a rainbow, and you'll see it's a full circle.

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Q: Why the rainbow is always a semi circle?
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Related questions

Can a rainbow be made in a different shape?

No, rainbows are always in the shape of a circular arc due to the physics of light refraction and reflection in water droplets. The shape of a rainbow is determined by the angle at which sunlight is refracted and reflected in the droplets in the atmosphere.


Is half a circle always called a semi-circle?

Yes, that is the definition of a semicircle.


Is there a end to a rainbow?

No there is Not. Fact: A rainbow is just one big circle. My mother works for American Airlines, we were flying to Orlando, Florida and we flew through one. So no there is NOT a end to a rainbow.


Does a rainbow ever end?

No, a rainbow is a full circle. However, we typically only see a semi-circle due to the horizon blocking the lower half.


A rainbow viewed from an airplane may form a complete circle where will the shadow of the airplane appear?

The shadow of the airplane will appear at the center of the complete circle formed by the rainbow. This is because the shadow is always cast opposite to the direction of the sunlight, and the sunlight is directly behind the airplane when a complete circle rainbow is seen.


What are the antonyms for semi circle?

Circle. That is the opposite of semi circle.


What do you call half of a circle?

A semi-circle


When was The Rainbow Circle created?

The Rainbow Circle was created in 1893.


What name is given to half a circle?

semi circle


What is the base shape of a semi - circle have?

semi-circle


What is the half of a circle called?

A semi-circle the answere is semi-circle or a breve


Why rainbow seems to be round high up in the air?

A rainbow appears as a circle when viewed from an airplane because the observer is seeing the full circular arc of the rainbow due to their high altitude. The shape of a rainbow is actually a full circle, but when viewed from the ground, the bottom half is usually blocked by the horizon. So, from higher altitudes, the full circle can be seen.