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en.wikipedia.org/wiki/On_the_Sizes_and_Distances_(Aristarchus)

On the Sizes and Distances (of the Sun and Moon) (Περὶ μεγεθῶν καὶ ἀποστημάτων [ἡλίου ... The size of the Earth's shadow in relation to the Moon during a lunar eclipse; The angle between the Sun and Moon during a half moon is very close to .... where θ is the apparent radius of the Moon and Sun measured in degrees.

www.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 ...

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.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.

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

Note that a lunar eclipse can only occur when the moon is in the FULL phase. ... the moon can shadow the sun's light as viewed from the Earth, and thus the Earth ... Solar eclipses would not very interesting if the angular diameter of the moon ...

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 ...

earthsky.org/space/coincidence-that-sun-and-moon-seem-same-size

Jun 26, 2013 ... The sun and moon appear the same size in Earth's sky because the sun's diameter is ... This type of event is called an annular or ring eclipse. ... Bottom line : The sun's diameter is about 400 times larger than that of the moon ...

www.sciencebuddies.org/science-fair-projects/project_ideas/Astro_p018.shtml

How big a ruler would you need to measure the circumference of the Earth? Did you know that you can do it with a yardstick? (And you won't have to travel all ...

www.eso.org/public/outreach/eduoff/aol/market/experiments/middle/skills201.html

Oct 28, 1996 ... II.1 Lunar Eclipse: The Moon's diameter and distance to the Earth. Before you start, beware that most of the following illustrations are wrong!

www.khanacademy.org/partner-content/nasa/measuringuniverse/measure-the-solarsystem/a/size-of-the-moon

We previously determined that the diameter of the earth is 12742 km. Now we want to ... His measurement begins with the observation of a total lunar eclipse.