April 12
April 12 is the 103rd day of the year in the Gregorian calendar; 263 days remain until the year's end. It falls in spring (northern hemisphere) and under the astrological sign of Aries.
Day of year
103
Days remaining
263
ISO week
15
Zodiac
Aries
Season
Spring
Sun declination
+8.7°
External references
Curated jump-off points to the major almanacs, encyclopaedias and primary sources for this date.
Wikipedia: this day →Britannica: this day →LoC: Today in History →History.com: this day →On-This-Day.com →BBC: On This Day →NYT: this day →Time and Date →NASA APOD archive →U.S. Naval Observatory →Wolfram|Alpha →Wikidata →Google Books →JSTOR →Internet Archive →
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Astronomy
Computed via Cooper's formula. Positive declination = Sun north of the celestial equator (Northern Hemisphere summer).
On April 12 the Sun's declination is approximately +8.7°. 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 12.
Position in the year
Holidays & observances
- International Day of Human Space Flight (UN — Yuri's Night)
Events
A selection of widely-documented historical events that took place on this date. Years marked BCE follow standard astronomical convention.
- 1861 — American Civil War began with Confederate forces firing on Fort Sumter, South Carolina. ↗(165 years ago)
- 1945 — U.S. President Franklin D. Roosevelt died of a cerebral haemorrhage; Harry S. Truman became president. ↗(81 years ago)
- 1955 — Jonas Salk's polio vaccine was declared safe and effective. ↗(71 years ago)
- 1961 — Soviet cosmonaut Yuri Gagarin became the first human to fly in space and orbit the Earth, aboard Vostok 1. ↗(65 years ago)
- 1981 — The Space Shuttle Columbia made its maiden flight (STS-1). ↗(45 years ago)
Notable births
Notable deaths
- 1945 — Franklin D. Roosevelt. ↗(81 years ago)
Numerical & calendrical curiosities
| Day-of-year (103) | 103 · prime |
|---|---|
| Days remaining (263) | 263 |
| Date code DDMMYYYY | 12042026 · no palindrome in next 200 years |
| Sun declination | +8.67° (Cooper approximation) |
| Distance from solstice | 69 days |