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What Happened Today in History?

Posted by Kronos Profile 04/07/25 at 12:12PM History See more by Kronos
1139 CE, July 25

The Battle of Ourique takes place, where the forces of Portuguese count Afonso Henriques (of the House of Burgundy) defeat those led by the Almoravid governor of Córdoba, Muhammad Az-Zubayr Ibn Umar, identified as "King Ismar" in Christian chronicles. More

1898 CE, July 25

During the Spanish-American War, the U.S. invaded Puerto Rico, which was then a Spanish colony. In 1917, Puerto Rico became an unincorporated Territory of the U.S. and Puerto Ricans became American citizens. Partial self-government was granted in 1947 allowing citizens to elect their own governor. In 1951, Puerto Ricans wrote their own constitution and elected a non-voting commissioner to represent them in Washington. More

1921 CE, July 25

The Insulin hormone is successfully isolated by Canadian doctor Frederick Banting and his assistant Charles Best, a Biochemist. The scientific work continued and two additional contributors entered the scene; Dr James R. Mcleod and James Bertram Collip, also a biochemist. The four participants had a difficult relationship. In 1923, Banting and Macleod were jointly awarded the 1923 Nobel Prize in Physiology or Medicine "for the discovery of insulin". By 1923 Insulin was in full production available to patients. More

A Comment by Loy

Your avatar
Loy • 04/08/2025 at 03:36PM • Like 1 Profile

Love the new UI - it is fun to be able to easily look up specific days, years and months throughout history. I must control me ADHD 😳🙂

NASA Astronomy Picture of the Day:

Meteors from the Kappa Cygnid meteor shower are captured in this time-lapse composite skyscape. The minor meteor shower, with a radiant not far from its eponymous star Kappa Cygni, peaks in mid-August, almost at the same time as the much better-known and better-observed Perseid meteor shower. But, seen to have a peak rate of only about 3 meteors per hour, Kappa Cygnids are vastly outnumbered by the more popular, prolific Perseid shower's meteors that emanate from the heroic constellation Perseus. To capture dozens of Kappa Cygnids, this long term astro-imaging project compiled meteors in exposures selected from over 51 August nights during the years 2012 through 2024. Most of the exposures with identified Kappa Cygnid meteors were made in August 2021, a high point of the shower's known 7-year activity cycle. All twelve years worth of Kappa Cygnids are registered against a base sea and night skyscape of the Milky Way above Elafonisi Beach, Crete, Greece, also recorded in August of 2021.

Photo by Petr Horálek

NASA Astronomy Picture of the Day:

very 15 years or so, Saturn's rings are tilted edge-on to our line of sight. As the bright, beautiful ring system grows narrower and fainter it becomes increasingly difficult to see for denizens of planet Earth. But it does provide the opportunity to watch transits of Saturn's moons and their dark shadows across the ringed gas giant's still bright disk. Of course Saturn's largest moon Titan is the easiest to spot in transit. In this telescopic snapshot from July 18, Titan itself is at the upper left, casting a round dark shadow on Saturn's banded cloudtops above the narrow rings. In fact Titan's transit season is in full swing now with shadow transits every 16 days corresponding to the moon's orbital period. Its final shadow transit will be on October 6, though Titan's pale disk will continue to cross in front of Saturn as seen from telescopes on planet Earth every 16 days through January 25, 2026.

Photo by Every 15 years or so

“The past only comes back when the present runs so smoothly that it is like the sliding surface of a deep river,” Virginia Woolf wrote some years before she filled her coat-pockets with stones, waded into the River Ouse near her house, and, unwilling to endure what she had barely survived in the past, slid beneath the smooth surface of life."  More at The Marginalian ➜

NASA Astronomy Picture of the Day:

Have you ever seen a fireball? In astronomy, a fireball is a very bright meteor -- one at least as bright as Venus and possibly brighter than even a full Moon. Fireballs are rare -- if you see one you are likely to remember it for your whole life. Physically, a fireball is a small rock that originated from an asteroid or comet that typically leaves a fading smoke trail of gas and dust as it shoots through the Earth's atmosphere. It is unlikely that any single large ground strike occurred -- much of the rock likely vaporized as it broke up into many small pieces. The featured picture was captured last week from a deadwood beach in Cape San Blas, Florida, USA. Piece it Back Together: Astronomy Puzzle of the Day

Photo by Jason Rice

NASA Astronomy Picture of the Day:

Can some supernovas explode twice? Yes, when the first explosion acts like a detonator for the second. This is a leading hypothesis for the cause of supernova remnant (SNR) 0509-67.5. In this two-star system, gravity causes the larger and fluffier star to give up mass to a smaller and denser white dwarf companion. Eventually the white dwarf's near-surface temperature goes so high that it explodes, creating a shock wave that goes both out and in -- and so triggers a full Type Ia supernova near the center. Recent images of the SNR 0509-67.5 system, like the featured image from the Very Large Telescope in Chile, show two shells with radii and compositions consistent with the double detonation hypothesis. This system, SNR 0509-67.5 is also famous for two standing mysteries: why its bright supernova wasn't noted 400 years ago, and why no visible companion star remains.

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