International Mole Day
International Mole Day is held on October 23. This event in the third decade of the month October is annual. 
Help us
Help us 
Mole Day was proposed in an article in The Science Teacher in early 1980s. Inspired by the article, Maurice Oehler, a chemistry teacher (now retired) in Prairie du Chien, Wisconsin, created the National Mole Day Foundation in 1991.
Mole Day is an unofficial holiday celebrated among chemists, chemistry students and chemistry enthusiasts on October 23, between 6:02 a.m. and 6:02 p.m., making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from the Avogadro number, which is approximately 6.02×1023, defining the number of particles (atoms or molecules) in one mole (mol) of substance, one of the seven base SI units.
Similar holidays and events, festivals and interesting facts
International Caps Lock Day on October 22
Fechner Day on October 22 (International observance);
International Day for the Protecting Men's Nervous System From Women's Violence on October 22
World Traditional Medicine Day on October 22
International Snow Leopard Day on October 23
World Champagne Day on October 23 (Celebrated on the penultimate Friday of October);
International Kabuki Syndrome Day on October 23
Global Day of Action for Child Survival on October 23
World Polio Day on October 24
International Day of Climate Action on October 24
World Tripe Day on October 24
Global Media and Information Literacy Week on October 24
Astronomy Day in Argentina on October 24
Libraries Day in Spain on October 24
Free Holiday Calendar widgets for websites