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April 13

Day 104 of 366 · ISO week 15 · Aries · Spring (Northern Hemisphere)

April 13 is the 104th day of the year in the Gregorian calendar; 262 days remain until the year's end. It falls in spring (northern hemisphere) and under the astrological sign of Aries.

Day of year
104
Days remaining
262
ISO week
15
Zodiac
Aries
Season
Spring
Sun declination
+9.0°

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

Solar declination through the year — the Sun's apparent latitude on Earth. April 13 ≈ +9.0°
0° +23° −23° +9.0°
Computed via Cooper's formula. Positive declination = Sun north of the celestial equator (Northern Hemisphere summer).

On April 13 the Sun's declination is approximately +9.0°. 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 13.

Position in the year

Position in the calendar year — day 104 of 366 (with 262 remaining)
JanFebMarAprMayJunJulAugSepOctNovDec Apr 13

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.

Notable births

Notable deaths

Numerical & calendrical curiosities

Day-of-year (104)2^3 × 13 · composite (no)
Days remaining (262)2 × 131
Date code DDMMYYYY13042026 · no palindrome in next 200 years
Sun declination+9.04° (Cooper approximation)
Distance from solstice68 days

Cross-references

The 13th of every other month

January 13February 13March 13May 13June 13July 13August 13September 13October 13November 13December 13

Adjacent days

← April 12April 14 →

Days nearby

-30 days · March 14-7 days · April 6+7 days · April 20+30 days · May 13

Themes: jefferson-bdayjallianwala-baghapollo-13-crisis

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