Nice pictures, but I'm afraid that one of the moon's shadow over Europe during a solar eclipse is a fake. The Sun isn't a point source, it's about half a degree wide. That means shadows from sunlight have 'fuzzy' edges, above and beyond any diffraction effects. If you look at the shadow of a telephone pole, it's sharp at the bottom, and fuzzy at the top, where the 0.5 degree angle has more distance to spread out.
If the moon is casting the shadow, 385,000km away, that half-degree between full light and no light is almost 3400km on the Earth's surface, assuming the Sun went behind a straight edge. The fact that the Moon is round means it's even 'fuzzier' on the edges of the shadow (called the penumbra, the area where any part of the face of the sun is blocked off). The only shadow edge you can see from space is the 'Umbra', in a total solar eclipse, which is the area where ALL of the face of the sun is blocked off. That's much smaller, tens or hundreds of kilometers across, not thousands. Even that's a bit 'fuzzy edged' because of difraction.
There's a good image of a real eclipse shadow here:
![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
no subject
Date: 2007-08-21 08:30 am (UTC)If the moon is casting the shadow, 385,000km away, that half-degree between full light and no light is almost 3400km on the Earth's surface, assuming the Sun went behind a straight edge. The fact that the Moon is round means it's even 'fuzzier' on the edges of the shadow (called the penumbra, the area where any part of the face of the sun is blocked off). The only shadow edge you can see from space is the 'Umbra', in a total solar eclipse, which is the area where ALL of the face of the sun is blocked off. That's much smaller, tens or hundreds of kilometers across, not thousands. Even that's a bit 'fuzzy edged' because of difraction.
There's a good image of a real eclipse shadow here:
http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=17228