April 15
April 15 is the 106th day of the year in the Gregorian calendar; 260 days remain until the year's end. It falls in spring (northern hemisphere) and under the astrological sign of Aries.
Day of year
106
Days remaining
260
ISO week
16
Zodiac
Aries
Season
Spring
Sun declination
+9.8°
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 15 the Sun's declination is approximately +9.8°. 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 15.
Position in the year
Holidays & observances
- Tax Day (United States, typical filing deadline)
Events
A selection of widely-documented historical events that took place on this date. Years marked BCE follow standard astronomical convention.
- 1755 — Samuel Johnson's A Dictionary of the English Language was published in London. ↗(271 years ago)
- 1865 — U.S. President Abraham Lincoln died nine hours after being shot. ↗(161 years ago)
- 1912 — The RMS Titanic sank in the North Atlantic Ocean, killing more than 1,500 people. ↗(114 years ago)
- 1947 — Jackie Robinson made his MLB debut, breaking baseball's colour line. ↗(79 years ago)
- 2013 — Two pressure-cooker bombs exploded near the finish line of the Boston Marathon, killing three. ↗(13 years ago)
- 2019 — Notre-Dame de Paris cathedral was severely damaged by a fire. ↗(7 years ago)
Notable births
Notable deaths
Numerical & calendrical curiosities
| Day-of-year (106) | 2 × 53 · composite (no) |
|---|---|
| Days remaining (260) | 2^2 × 5 × 13 |
| Date code DDMMYYYY | 15042026 · no palindrome in next 200 years |
| Sun declination | +9.78° (Cooper approximation) |
| Distance from solstice | 66 days |