April 18
April 18 is the 109th day of the year in the Gregorian calendar; 257 days remain until the year's end. It falls in spring (northern hemisphere) and under the astrological sign of Aries.
External references
Curated jump-off points to the major almanacs, encyclopaedias and primary sources for this date.
Astronomy
On April 18 the Sun's declination is approximately +10.9°. At this latitude the Sun is north of the celestial equator, giving the Northern Hemisphere longer days than nights.
For specific rise/set times at your location, see the U.S. Naval Observatory, or the NASA APOD archive for any imagery published on a April 18.
Position in the year
Holidays & observances
No widely-observed holidays catalogued for this day in our base set. See the external almanacs above for region-specific observances.
Events
A selection of widely-documented historical events that took place on this date. Years marked BCE follow standard astronomical convention.
1775 — Paul Revere, William Dawes and Samuel Prescott rode from Boston to warn American colonists of approaching British troops. ↗(251 years ago)more
"Paul Revere's Ride" is an 1860 poem by American poet Henry Wadsworth Longfellow that commemorates the actions of American patriot Paul Revere on April 18, 1775, although with significant inaccuracies. It was first published in the January 1861 issue of The Atlantic Monthly.
1906 — A magnitude-7.9 earthquake struck San Francisco, killing some 3,000 people. ↗(120 years ago)more
The 1906 San Francisco earthquake was a major earthquake which struck the coast of Northern California at 05:12 am Pacific Standard Time on Wednesday, April 18, 1906. With an estimated moment magnitude of 7.9 and a maximum Mercalli intensity of XI (Extreme), it created high-intensity shaking from Eureka on the North Coast to the Salinas Valley, an agricul...
1923 — Yankee Stadium opened in the Bronx. ↗(103 years ago)more
The original Yankee Stadium was located in the Bronx in New York City. It was the home of the New York Yankees from 1923 to 2008, except for 1974–1975 when it was renovated. It hosted 6,581 Yankees regular season home games during its 85-year history.
1955 — Albert Einstein died at Princeton, New Jersey. ↗(71 years ago)more
Albert Einstein was a German-born theoretical physicist best known for developing the theory of relativity. Einstein also made important contributions to quantum theory. His mass–energy equivalence formula E = mc2, which arises from special relativity, has been called "the world's most famous equation".
Notable births
1857 — Clarence Darrow, American lawyer. ↗(169 years ago)more
Clarence Seward Darrow was an American lawyer and politician who became famous in the 19th century for high-profile representations of trade union causes, and in the 20th century for several criminal matters, including the Leopold and Loeb murder trial, the Scopes "monkey" trial, and the Ossian Sweet defense.
1946 — Hayley Mills, English actress. ↗(80 years ago)more
Hayley Catherine Rose Vivien Mills is an English actress and singer. A daughter of Sir John Mills and Mary Hayley Bell and younger sister of actress Juliet Mills, she began her acting career as a child and was hailed as a promising newcomer, winning the BAFTA Award for Most Promising Newcomer for her performance in the British crime drama film Tiger Bay (...
Notable deaths
- 1955 — Albert Einstein. ↗(71 years ago)
more
Albert Einstein was a German-born theoretical physicist best known for developing the theory of relativity. Einstein also made important contributions to quantum theory. His mass–energy equivalence formula E = mc2, which arises from special relativity, has been called "the world's most famous equation".
Numerical & calendrical curiosities
| Day-of-year (109) | 109 · prime |
|---|---|
| Days remaining (257) | 257 |
| Date code DDMMYYYY | 18042026 · no palindrome in next 200 years |
| Sun declination | +10.87° (Cooper approximation) |
| Distance from solstice | 63 days |