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en.wikipedia.org/wiki/Eclipse

An eclipse is an astronomical event that occurs when an astronomical object is temporarily .... umbra and penumbra are applicable. This is because Earth's apparent diameter from the viewpoint of the Moon is nearly four times that of the Sun.

eclipse2017.nasa.gov/sites/default/files/Math_Challenge9_.pdf

The center-to-center distance between Earth and moon is 372,027 ... We can calculate the radius of moon shadow on the Earth's surface over North America.

eclipse2017.nasa.gov/challenge-8-%E2%80%93-exploring-angular-diameter

From the surface of Earth, the diameter of our moon is about ½ a degree and the Andromeda galaxy is about 3 degrees across. In fact, because of the enormous ...

eclipse2017.nasa.gov/challenge-10-%E2%80%93-shadow-speed-and-earth%E2%80%99s-rotation

Earth rotates once every 23h 56m (23.933h), so at the equator where Earth's circumference is 2ΠR = 2x3.14x6378 km = 40,000 km it has to travel at a speed of ...

www.eso.org/astronomyonline/market/experiments/basic/skills102.html

Computing the Size and the Distance of the Moon by Means of Eclipse Observations. 1. ... Then, try to estimate the diameter of the Earth's shadow. This is more ...

www.timeanddate.com/eclipse/umbra-shadow.html

When the Earth enters the Moon's shadow, we see a solar eclipse; when the ... Earth's surface during parts of the eclipse, meaning that its diameter is close to ...

www.pas.rochester.edu/~blackman/ast104/eclipses.html

ANNULAR SOLAR ECLIPSES occur when a region on the Earth's surface is in line ... at the Earth, traced by the orbit of the moon or sun, the circumference of the  ...

www.livemint.com/Sundayapp/8wRiLexg1N2IOXjeK2BKcL/How-Aryabhata-got-the-earths-circumference-right-millenia-a.html

Jan 14, 2017 ... The first known person to calculate the circumference of the earth ... the moon just about completely engulfing the sun during a total eclipse.

umich.edu/~lowbrows/astrophotos/alway/lunareclipse.html

A lunar eclipse happens when the Moon passes into the Earth's Shadow. .... and read off the diameter of the Earth's inner shadow (umbra) from the circle that ...