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On January 20th, 2019, a total lunar eclipse was possible to be observed inSantiago, Chile. Using a smartphone attached to a telescope, photographs of thephenomenon were taken. With Earth's shadow on those images, and using textbookgeometry, a simple open-source software and analytical procedures, we wereallowed to calculate the ratio between the radii of the Moon and the Earth. Theresults are in very good agreement with the correct value for such ratio. Thisshows the strength of the smartphone technology to get powerful astronomicalresults in a very simple way and in a very short amount of time.

Estimating the Moon to Earth radius ratio with a smartphone, a telescope and an eclipse