5. More to explore and to get a better understanding of eclipses.

5a: How does solar eclipse arise?
A sufficient condition for solar eclipse is new moon, when Moon moves between Sun and Earth. The moon can cover the solar disk partially (penumbral eclipse) or completely (total solar eclipse).

Standing on Earth the total solar eclipse can be seen in the area, where the Moon's umbra encounters Earth's ground (umbra shadow).
A partial eclipse (penumbra) can be seen where half shadow of Moon hits the ground.
A solar eclipse can only be observed in a small area on the earth, because Moon's shadow (umbra) is rather small. The moon covers the sun completely, when you are inside its umbra. This is due to Moon's size and Moon's distance from Earth.
Later I will talk about the apparent size of the moon (see 5e).

Keine Angabe
Fig. 42: Emergence of a solar eclipse
© Sternfreunde Bad Salzuflen e.V.
and courtesy of
Verein der Sternfreunde Bad Salzuflen e.V.

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5b: What is the difference between solar and lunar eclipse?

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