A solar eclipse occurs when the moon passes between the Sun and the Earth so that the Sun is fully or partially covered. This can only happen during a new moon, when the Sun and Moon are in conjunction as seen from the Earth. At least two and up to five solar eclipses can occur each year on Earth, with between zero and two of them being total eclipses.
By a fortunate coincidence, the sun's diameter is 400 times larger than that of the moon, and at the same time, it is 400 times as far away. From where we are, this creates the illusion that they are the same size. If we look through a filter at the sun, it looks exactly like the moon on a full moon night. When the moon passes in front of the sun, the shadow falls on the earth and it appears to exactly cover the sun's disc. This is what a solar eclipse is - a shadow.
During a solar eclipse, the moon actually casts two shadows towards earth. One shadow shaped like a cone is called the umbra. This becomes narrower as it reaches the earth. No direct sunlight penetrates into this area. The path of this is called the path of totality. If you are positioned in this area than you can see a complete blocking of the sun and view a total solar eclipse. Total eclipse is observable only within a narrow strip of land or sea over which the umbra passes.
The second shadow is called the penumbra which spreads out as it reaches the earth. The penumbra is spread over a large area. People viewing the eclipse from this area of the earth's surface will see only a partial blocking of the sun.
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