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Find number abc

If acc8b - a0408 = cabc find number abc. Multiple solutions may exist.

Correct answers: 1

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People say that there is no di...

People say that there is no difference between ‘finished’ and ‘complete’. I say there is...
Marry the right person, and you’re COMPLETE.
Marry the wrong person, and you’re FINISHED.

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Camera obscura

In 1544, a solar eclipse was viewed at Louvain, which was later depicted in the first published book illustration of the camera obscura in use. Dutch mathematician and astronomer Reinerus Gemma-Frisius viewed a solar eclipse using a hole in one wall of a pavillion to project the sun's image upside down onto the opposite wall. He published the first illustrationof a camera obscura, depicting his method of observation of the eclipse in De Radio Astronomica et Geometrica (1545). Several astronomers made use of such a device in the early part of the 16th century. Both Johannes Kepler and Christopher Scheiner used a camera obscura to study the activity of sunspots. The technique was known to Aristotle (Problems, ca 330 BC).

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