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Printable version; Page information; Get shortened URL ... Description=Diagram of umbra, penumbra and antumbra in a two-body system. ... File:Diagram of umbra ...
English: Diagram showing the umbra, penumbra and antumbra of the shadow of the earth in sunlight. The umbra is the dark inner shadow and the penumbra is the faint outer shadow. The path of totality is the path that is travelled by the umbra and anyone located on it can see the total eclipse.
Umbra, penumbra and antumbra of Earth and images that could be seen at some points in these areas (Note: the relative size and distance of the bodies shown are not to scale.)“… The Earth’s shadow has two distinct parts,… the UMBRA is the part of the shadow where all direct sunlight is blocked by the Earth; the PENUMBRA of the shadow is ...
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English: This diagram explains why the penumbra of a solar eclipse is approximately twice the size of the Moon. Since the Sun and Moon have nearly the same angular diameter, the umbra is reduced to nearly a single point in length. Therefore the three angles marked in red are nearly equal, all with a base equal to the Moon's diameter.
Diagram of the Wilson effect. The umbra is the darker inner circle and the penumbra is the lighter ring around the umbra. In astronomy, the Wilson effect is the perceived depression of a sunspot's umbra, or center, in the Sun's photosphere. The magnitude of the depression for the umbra is between 500 and 1000 km, with an average of 600 km. [1]
Penumbra is the name for the partial shadow of partial eclipse. Antumbra the name for the special ring effect. All three ideas belong together as the diagram (if extended) would demonstrate. An article heading Umbra, penumbra and antumbra is just a little unwieldly imo, especially when it is clear these terms are all based on -umbra.
The Evershed effect, named after the British astronomer John Evershed, [1] is the radial flow of gas across the photospheric surface of the penumbra of sunspots from the inner border with the umbra towards the outer edge.