November 23 Holidays

National Espresso Day celebrates the concentrated coffee beverage extracted by forcing hot water through finely-ground coffee — a method perfected by Achille Gaggia, whose 1938 piston machine replaced steam pressure with a spring-loaded lever, producing the crema-topped shot that became the foundation of cappuccino, latte, and americano culture. National Cashew Day celebrates the cashew — the nut that grows at the base of the cashew apple, native to northeastern Brazil, and introduced to the world by Portuguese traders after 1500 — now the world’s third most valuable nut crop, generating more than $9 billion annually. Fibonacci Day is observed on November 23 (11/23) because the date digits 1, 1, 2, 3 are the first four numbers of the Fibonacci sequence — in which each number is the sum of the two preceding it, a sequence that appears in sunflower spirals, nautilus shells, and the arrangement of leaves on a stem. National Sovereignty Day Argentina — Día de la Soberanía Nacional — marks November 20, 1845, when Argentina repelled a combined Anglo-French fleet at the Battle of Vuelta de Obligado, a date whose floating holiday observance falls on November 23 in 2026.