March 31 Day 91 of 366 · ISO week 13 · Aries · Spring (Northern Hemisphere)
March 31 is the 91st day of the year in the Gregorian calendar; 275 days remain until the year's end. It falls in spring (northern hemisphere) and under the astrological sign of Aries.
March 31
91st day of the year
March 2024 calendar — highlighted: the 31st
Mo Tu We Th Fr Sa Su
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Day of year 91 / 366 Days remaining 275 ISO week 13 Weekday in 2024 Sunday Zodiac (Western) Aries Zodiac (sidereal) Aries Season (N. hemi.) Spring Sun declination +4.0° Birthstone Aquamarine, Bloodstone Birth flower Daffodil
External references Curated jump-off points to the major almanacs, encyclopaedias and primary sources for this date.
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Astronomy
Solar declination through the year — the Sun's apparent latitude on Earth. March 31 ≈ +4.0°
0°
+23°
−23°
+4.0°
Computed via Cooper's formula. Positive declination = Sun north of the celestial equator (Northern Hemisphere summer).
On March 31 the Sun's declination is approximately +4.0°. 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 March 31.
Position in the year
Position in the calendar year — day 91 of 366 (with 275 remaining)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mar 31
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.
1854 — Commodore Matthew Perry signed the Convention of Kanagawa, opening Japan to American trade. ↗ (172 years ago) 1889 — The Eiffel Tower was officially opened in Paris. ↗ (137 years ago) 1909 — Construction began on the RMS Titanic at Belfast. ↗ (117 years ago) 1959 — The 14th Dalai Lama crossed the border into India and was granted asylum. ↗ (67 years ago) Notable births
1596 — René Descartes, French philosopher and mathematician. ↗ (430 years ago) 1732 — Joseph Haydn, Austrian composer. ↗ (294 years ago) 1948 — Al Gore, 45th U.S. Vice-President. ↗ (78 years ago) Notable deaths
1855 — Charlotte Brontë, English novelist (Jane Eyre). ↗ (171 years ago) Numerical & calendrical curiosities Day-of-year (91) 7 × 13 · composite (no) Days remaining (275) 5^2 × 11 Date code DDMMYYYY 31032026 · no palindrome in next 200 years Sun declination +4.02° (Cooper approximation) Distance from solstice 81 days
Cross-references The 31st of every other month Adjacent days Days nearby Themes: eiffel-tower kanagawa titanic-construction
WikiDay — On this day. About this day. An editorial almanac of every calendar day of the year, drawing on public sources including Wikipedia , Encyclopædia Britannica , the U.S. Library of Congress: Today in History , the U.S. Naval Observatory , NASA Astronomy Picture of the Day , Time and Date , and Wikidata . Brief factual statements are presented for editorial reference under fair-use principles; deeper accounts and copyrighted media remain with their original publishers via the external links on each page. Unofficial educational resource.
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