* Astronomy

Mole Day is an unofficial holiday celebrated among chemists on October 23, between 6:02 AM and 6:02 PM, making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from Avogadro's number, which is approximately 6.02 x 10^23, defining the number of particles (atoms or molecules) in one mole of substance, one of the seven base SI units.
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