May 20: Holidays, Historical Events, Famous Birthdays & Zodiac Sign
On May 20, 1927, a 25-year-old Charles Lindbergh pointed the Spirit of St. Louis toward Paris and changed aviation forever — but the date also produced the world's first atlas, the patent for blue jeans, and the redefinition of the kilogram.
About May 20
May 20 has a habit of marking firsts that reshape how we see the world. Abraham Ortelius kicked things off in 1570 by publishing the Theatrum Orbis Terrarum, widely regarded as the first true modern atlas — a single bound volume of uniform maps that gave Europe its first comprehensive picture of the known world. Exactly 297 years later, Levi Strauss and Jacob W. Davis secured a U.S. patent for strengthening work trousers with copper rivets, giving the planet its first pair of blue jeans. And in 1927, Charles Lindbergh roared down a muddy Long Island runway in the Spirit of St. Louis, bound for Paris and the first nonstop solo transatlantic flight. Five years to the day later, Amelia Earhart departed Newfoundland on her own solo Atlantic crossing, landing in Ireland and becoming the first woman to achieve the feat.
The date also carries a strong scientific and diplomatic thread. Seventeen nations signed the Metre Convention in 1875, establishing a shared international system of measurement that still governs science and trade. In 1964, radio astronomers Robert Woodrow Wilson and Arno Penzias stumbled onto the cosmic microwave background — the lingering echo of the Big Bang — while working at Bell Labs. And in 2019, the International System of Units got its most significant overhaul in over a century when the kilogram was redefined in terms of fundamental physical constants, retiring a 130-year-old platinum cylinder in a Paris vault.
On the observance front, May 20 is World Bee Day, honoring the vital pollinators that keep roughly a third of the world's food supply growing. It is also Independence Restoration Day in East Timor, marking the young nation's formal emergence from Indonesian rule in 2002, and National Awakening Day in Indonesia, commemorating the 1908 birth of the country's nationalist movement. For a lighter touch, it's Be a Millionaire Day, National Rescue Dog Day, and Eliza Doolittle Day — a fittingly eclectic mix for a date that spans everything from Byzantine coronations to the redefinition of physical reality.
Holidays & Observances on May 20
- Day of Remembrance (Cambodia)
- Emancipation Day (Florida)
- European Maritime Day (European Council)
- Independence Restoration Day, celebrates the independence of East Timor from Indonesia in 2002.
- Josephine Baker Day (NAACP)
- National Awakening Day (Indonesia), and its related observances: Indonesian Doctor Day (Indonesia)
- National Day (Cameroon)
- World Bee Day
Fun & National Days on May 20
- Be a Millionaire Day — Pretend your bank account has a few extra zeros today — window-shop a yacht, just don't actually buy one.
- Eliza Doolittle Day — Channel your inner Cockney flower girl and practice your vowels — the rain in Spain stays mainly in the plain.
- National Rescue Dog Day — Visit your local shelter, donate supplies, or just give your own rescue pup an embarrassingly long belly rub.
- Flower Day — Grab a bouquet from the farmer's market and brighten someone's kitchen table with a splash of color.
- National Quiche Lorraine Day — Bake the classic French tart with bacon, cream, and Gruyère — it's essentially a savory hug in a pastry shell.
- Emergency Medical Services for Children Day
- International Clinical Trials Day
- International Red Sneakers Day
- National Juice Slush Day
- National Psychometrist Day
On This Day in History
- 325 — The First Council of Nicaea convenes, launching the first ecumenical council of the Christian Church to address foundational theological disputes.
- 1570 — Cartographer Abraham Ortelius publishes the Theatrum Orbis Terrarum, recognized as the first modern atlas and a landmark in the history of geography.
- 1609 — William Shakespeare's sonnets are published in London by Thomas Thorpe, possibly without the playwright's consent, introducing 154 poems to the reading public.
- 1714 — Johann Sebastian Bach conducts the debut of his Pentecost cantata Erschallet, ihr Lieder, BWV 172, at the Weimar castle chapel.
- 1775 — The Mecklenburg Declaration of Independence is reportedly signed in Charlotte, North Carolina, allegedly predating the Continental Congress's declaration by more than a year.
- 1873 — Levi Strauss and Jacob Davis receive a U.S. patent for work trousers reinforced with copper rivets, giving the world its first blue jeans.
- 1875 — Seventeen nations sign the Metre Convention in Paris, creating the International System of Units and a global framework for standardized measurement.
- 1927 — Charles Lindbergh departs Roosevelt Field on Long Island aboard the Spirit of St. Louis, embarking on the first nonstop solo flight across the Atlantic Ocean.
- 1932 — Amelia Earhart lifts off from Newfoundland to complete the first solo nonstop transatlantic flight by a female pilot, touching down in Ireland the following day.
- 1948 — Chiang Kai-shek is sworn in as the first President of the Republic of China after winning the country's presidential election in Nanjing.
- 1964 — Astronomers Robert Woodrow Wilson and Arno Penzias detect the cosmic microwave background radiation, providing the first observational evidence for the Big Bang theory.
- 2019 — The International System of Units redefines its base units using fundamental constants of nature, rendering the century-old physical prototype of the kilogram obsolete.
Famous Birthdays on May 20
- 1799 — Honoré de Balzac, Prolific French novelist whose sweeping La Comédie Humaine redefined realist fiction and surveyed an entire society in extraordinary detail.
- 1806 — John Stuart Mill, Influential English philosopher and economist whose works On Liberty and Utilitarianism remain foundational texts of classical liberal thought.
- 1851 — Emile Berliner, German-American inventor who developed the flat disc gramophone record, the recording format that dominated the music industry for most of the 20th century.
- 1860 — Eduard Buchner, German chemist who discovered that fermentation is driven by enzymes rather than living cells, earning the Nobel Prize and launching modern biochemistry.
- 1882 — Sigrid Undset, Norwegian novelist awarded the Nobel Prize in Literature for Kristin Lavransdatter, a sweeping medieval trilogy that richly depicts medieval Scandinavian life.
- 1908 — James Stewart, Beloved American actor whose Everyman persona illuminated classics like It's a Wonderful Life, Rear Window, and Mr. Smith Goes to Washington.
- 1915 — Moshe Dayan, Israeli military leader and politician whose iconic eye patch made him one of the most recognizable figures of 20th-century Middle Eastern geopolitics.
- 1921 — Cher, American singer and actress who conquered music, film, and television across six decades, winning Oscars, Grammys, and Emmys as an enduring pop icon.
- 1940 — Sadaharu Oh, Japanese-Taiwanese baseball legend who hit 868 career home runs, the professional baseball record, and managed Japan's first World Baseball Classic title.
- 1944 — Joe Cocker, Gravel-voiced English singer whose impassioned reworking of the Beatles' With a Little Help from My Friends became a defining sound of late-1960s rock.