September 26, 1950: The Day Europe's Sun Turned Blue

Today in 1950 · Tuesday, September 26, 1950

Marine Pfc. Luther Leguire raises the U.S. flag at the American consulate in Seoul as fighting rages, September 27, 1950

Marine Pfc. Luther Leguire raises the U.S. flag at the American consulate in Seoul as fighting rages, September 27, 1950 · U.S. Marine Corps photo by Sgt. John Babyak Jr., public domain, via Wikimedia Commons

On this day in 1950, people across northwestern Europe looked up and saw a blue sun — and that night, a blue moon. The cause sat an ocean away: high-altitude smoke from the Chinchaga firestorm in western Canada, the continent's largest recorded fire, had crossed the Atlantic after darkening North American skies the two days before.

The physics was a once-in-a-blue-moon coincidence in the most literal sense. The smoke's oil droplets, aged and sorted by their long journey, happened to reach almost exactly the size that scatters red light more than blue — the reverse of a normal sunset — so the disc of the sun itself shone blue through the haze. It is one of the few well-documented occasions when the proverbial 'blue moon' actually appeared.

Not everyone enjoyed the optics lesson: coming five years into the atomic age, the eerie light stirred fears in Europe of nuclear war, just as the midday darkness had in America. And a period footnote for this series about the year's daily life: 1950 was also the year Frank X. McNamara's new Diners Club card — the first general-purpose credit card — was teaching restaurant-goers a new way to pay, its early ads promising 'a master credit card' at a hundred superb eating places. The world of 1950 was acquiring, in the same season, blue suns and plastic money.

Also on this day

  • The Second Battle of Seoul ended: UN forces completed the capital's recapture, and the US Eighth Army driving from the south linked up with X Corps at Osan.
  • The destroyer USS Brush struck a mine off Korea, killing 13 sailors.
  • The Creswell colliery disaster killed 80 miners in Derbyshire, England.
  • The UN Security Council recommended Indonesia's admission to the United Nations.

🎵 On the radio that week: America’s No. 1 song was “Goodnight Irene” by Gordon Jenkins and The Weavers (Billboard best sellers) — TIME magazine sniffed that the Weavers' polished version was 'dehydrated' and 'prettied up' — America bought it anyway. That sound never really left — we recreate 1950s doo-wop and slow-dance ballads every week: read the stories behind our songs or listen on the lovesong1950s channel.
🎬 At the movies: “My Blue Heaven” held the nation's No. 1 spot for a second straight week, with “Sunset Boulevard” right behind at No. 2 (Variety).
⚾ In sports: Philadelphia's free-fall cut a 7.5-game lead to a single game over Brooklyn entering the final day, while the idle Yankees clinched the pennant when Cleveland routed Detroit 12-2.

Sources: WeatherBug: the day the sun and moon turned blue · Phys.org: the year the sun turned blue · History of Information: Diners Club · Wikipedia: September 1950 · Billboard best-seller charts, 1950 (issue scans) · Variety National Boxoffice Survey, 1950 (Lantern scans) · Retrosheet 1950 game logs and box scores. Every fact above is drawn from the records linked here — no dramatization, no invented details.

More from this series: Today in 1950 — the daily archive · every post from September 2026

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