Size of shadow of the Moon on Earth during eclips and its speed?

Question

I want to know about the size of shadow of Moon on earth during luner eclips and proportion between original size of the moon and its shadow, moreover speed of this shadow on earth i mean from which speed this shadow travel on earth

Answer 1

The speed of the projected shadow upon the surface of the Earth is going to be nearly the same for every eclipse, but this effective speed does increase depending on where the shadow falls relative to the curvature of the planet.

Size adds another variable, since the moon's distance from the earth varies. In some eclipses (like an annular) the shadow of totality does not reach the surface of the earth, so the size can be as small as zero. Images in this wiki article will help you visualize this: http://en.wikipedia.org/wiki/Solar_eclipse#Geometry_of_an_eclipse

So, if I assume the moon is at its closest and the eclipse is happening with the sun/moon at an altitude of 90 degrees (noon at the equator on an equinox, for instance) I find a shadow size of a ~250km and a speed of ~1km/s. You can approximately calculate the distortion to the shadow by multiplying by the secant of the sun's in the sky. This actually calculates the size of the shadow on a plane tangent to the surface of the earth (rather than along the curved surface itself). Note that it is stretched only in the direction of the line passing through the observer, the moon and the sun. The speed of the shadow would scale in the same way.

Answer 2

not magic. common Physics. The sunlight is larger than the moon, yet is so distant interestingly an identical length. Earth is on the focal conjunction of those 2 bodies and that's why finished image voltaic eclipses are achieveable. The earth's shadow on the moon throughout the time of a lunar eclipse is considered in 2 stages, the umbra and the penumbra.

Answer 3

The size, proportion and position depend on where the earth and the moon are at the time of the eclipse. both the moon and earth are in elliptical orbit to each other and the sun. To compound this answer, you would have to consider the curvature of the earth at the time of the eclipse.

Answer 4

I'm assuming you are talking about a solar eclipse. The path and size varies. The size of totality is up to 250 km wide and a minimum of zero in the case of a hybrid eclipse. The maximum possible length of totality is 7 minutes and 29 seconds.