June 21
June 21 is the 173rd day of the year in the Gregorian calendar; 193 days remain until the year's end. It falls in summer (northern hemisphere) and under the astrological sign of Cancer.
Day of year
173
Days remaining
193
ISO week
25
Zodiac
Cancer
Season
Summer
Sun declination
+23.4°
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).
- The June solstice typically occurs around this date — the Northern Hemisphere's longest day, the Southern Hemisphere's shortest. The Sun reaches its maximum northern declination (about +23.44°).
Position in the year
Holidays & observances
- International Yoga Day (UN)
- Make Music Day (worldwide, on the solstice)
- World Music Day
Events
A selection of widely-documented historical events that took place on this date. Years marked BCE follow standard astronomical convention.
- 1788 — New Hampshire became the ninth U.S. state to ratify the Constitution, putting it into effect. ↗(238 years ago)
- 1893 — The first Ferris wheel premiered at the World's Columbian Exposition in Chicago. ↗(133 years ago)
- 1948 — The world's first stored-program computer, the Manchester Baby, ran its first program. ↗(78 years ago)
- 1989 — The U.S. Supreme Court ruled in Texas v. Johnson that flag-burning is constitutionally protected free speech. ↗(37 years ago)
Notable births
Notable deaths
- 1908 — Nikolai Rimsky-Korsakov, Russian composer. ↗(118 years ago)
Numerical & calendrical curiosities
| Day-of-year (173) | 173 · prime |
|---|---|
| Days remaining (193) | 193 |
| Date code DDMMYYYY | 21062026 · no palindrome in next 200 years |
| Sun declination | +23.44° (Cooper approximation) |
| Distance from solstice | 1 days |