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October 2021
delete iconadd icon6 days until Mole Day
Saturday October 23, 2021 (10/23/2021) at <a class='DU_date_ref_link' href='' title='midnight (00:00) before noon on this date'>midnight</a>
Method: October 23rd on Gregorian calendar
Length: 1 day
Period: 1 year

Mole Day is an unofficial holiday celebrated among chemists on October 23, between 6:02 AM and 6:02 PM,[1][2][3] 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 6.02×1023, defining the number of particles (atoms or molecules) in one mole of substance, one of the seven base SI units.

Mole Day originated in an article in The Science Teacher in the early 1980s.[4] Inspired by this article, Maurice Oehler, now a retired high school chemistry teacher from Prairie du Chien, Wisconsin, founded the National Mole Day Foundation (NMDF) on May 15, 1991.[4]

delete iconadd icon14 days until Halloween
Sunday October 31, 2021 (10/31/2021)
Method: October 31st on Gregorian calendar
Length: 1 day
Period: 1 year
November 2021
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