Ptolemy II Completes the Lighthouse of Alexandria

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• Astronomy09/11/2026@ThePinGang

  Total Solar Eclipse Over Luxor

  Luxor, Egypt

  

  Starts 08/02/2027UNVERIFIED68% CONFIDENCEin 313 days

  At 6 minutes 23 seconds over Egypt, the longest totality visible from land until 2114, crossing Spain, North Africa and the Arabian Peninsula.

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• Architecture09/15/2026@BuildDesk

  Angkor Wat, the Largest Religious Monument on Earth, is Completed for Suryavarman II

  Angkor Wat, Krong Siem Reap, Cambodia

  

  Starts 01/01/1150ESTIMATED73% CONFIDENCE876.7 years agoWikipedia's^[3] Angkor Wat article states construction "commenced in 1122 CE and was completed in 1150 CE," a period-based estimate rather than a single confirmed day, consistent with other sources citing the reign of Suryavarman II (1113-1150).

  Cambodia's Khmer king Suryavarman II built Angkor Wat as his state temple and eventual mausoleum, a 400-acre complex whose construction ran from around 1122 to 1150 CE.

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• Architecture09/14/2026@BuildDesk

  Sphinx Observatory Opens Atop the Jungfraujoch

  Jungfraujoch, Bernese Alps, Switzerland

  

  Starts 12/31/1937CONFIRMED87% CONFIDENCE88.7 years agoHappened as dated, per the source^[1]: "The Sphinx observatory ... was completed in 1937."

  The Sphinx Observatory, a research station tunnelled into a 3,571-metre Alpine summit above the Jungfraujoch, was completed in 1937 as one of Europe's most remote scientific buildings.

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• Astronomy09/11/2026@ThePinGang

  Extremely Large Telescope First Light

  Cerro Armazones, ChileEuropean Southern Observatory

  

  Starts 03/01/2029ESTIMATED56% CONFIDENCEin 2.4 yearsGiven as a target, not a fixed date, per en.wikipedia.org^[1]: "…and construction in July 2023, with the expected completion and first light set for March 2029.[13][…"

  A 39-metre segmented mirror in Chile's Atacama, collecting more light than all existing 8-10 metre telescopes combined. Estimated date.

  €1.1B

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• Movie09/14/2026@FilmDesk

  Christopher Nolan's The Odyssey Opens in Theaters

  100 Universal City Plaza, Universal City, CA 91608Universal Pictures

  

  Starts 07/17/2026CONFIRMED88% CONFIDENCE95%68 days agoFirm, already-passed release date confirmed by Deadline^[2] and Wikipedia: "was released on July 17, 2026."

  Christopher Nolan's IMAX-shot adaptation of Homer's epic follows Odysseus (Matt Damon) on his perilous voyage home to Ithaca after the Trojan War, facing the Cyclops Polyphemus, the Sirens, and Circe along the way.

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• Architecture09/15/2026@BuildDesk

  Prince Albert I Opens the Oceanographic Museum of Monaco

  Avenue Saint-Martin, 98000 Monaco-Ville, Monaco

  

  Starts 03/29/1910CONFIRMED87% CONFIDENCE116.5 years agoThe museum's own institute (oceano.org^[2]) and multiple tourism/history sources date its inauguration by Prince Albert I to 29 March 1910.

  Monaco's Prince Albert I inaugurated the Oceanographic Museum, an institution he founded to house his marine research, after eleven years of construction into a cliff face above the Mediterranean. The museum, later directed by Jacques Cousteau, remains one of the world's foremost centres for oceanography.

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• Architecture09/15/2026@BuildDesk

  Henraux Begins Quarrying Marble at Monte Altissimo

  Monte Altissimo, Seravezza, Tuscany, ItalyHenraux

  

  Starts 01/01/1821ESTIMATED57% CONFIDENCE205.7 years agoFondazione Henraux^[8] and Quarry Magazine^[7] both date the company's founding to 1821, but neither source gives a specific month or day.

  In 1821, landowner Marco Borrini and French businessman Jean-Baptiste Alexandre Henraux founded the Henraux marble company in Tuscany’s Apuan Alps. It still works the Monte Altissimo quarries first opened by Michelangelo in the 1500s and shown in Stone Men.

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• Astronomy09/20/2026@ScienceDesk

  Annular Solar Eclipse Crosses the South Indian Ocean

  Point of greatest eclipse at sea, off the South Indian Ocean

  

  Starts 10/03/2043 3:00AMSCHEDULED82% CONFIDENCEin 17.0 yearsNASA's^[1][2][3] eclipse catalogue gives the instant of greatest eclipse as 03:00:21 UT on 2043-10-03 (03:01:48 TD, the two separated by delta-T), from Saros series 154. Eclipse circumstances are computed from orbital mechanics, so the date and time are exact centuries ahead. This eclipse is non-central and has no published path table, so its place is the catalogue position, good to the whole degree.

  The Moon's shadow touches down at 03:00:21 UT on 2043-10-03, and the annular phase lasts up to along a path across the Earth crossing the South Indian Ocean. A partial eclipse is visible from Antarctica, southwestern Australia and the Indian Ocean.

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• Architecture09/15/2026@BuildDesk

  Egypt's Iconic Tower Completed

  New Administrative Capital, Egypt

  

  Starts 12/31/2024CONFIRMED87% CONFIDENCE1.7 years agoHappened as dated, per the source^[1]: the Iconic Tower's "official completion date was 2024".

  The 394-metre Iconic Tower in Egypt's New Administrative Capital was completed in 2024, becoming Africa's first supertall skyscraper and its tallest building.

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• Science09/22/2026@ScienceDesk

  The 1919 Eclipse Results Confirm General Relativity

  Royal Astronomical Society, Piccadilly, St. James's, Westminster, Mayfair, City of Westminster, Greater London, England, W1J 0PA, United KingdomRoyal Astronomical Society

  

  Starts 11/06/1919CONFIRMED85% CONFIDENCE106.9 years agoWikipedia's^[1][2][3] Eddington experiment article dates the session: "The presentation of the results at the joint 6 November 1919 session of Royal Society and Royal Astronomical Society led to intensive press coverage first in Great Britain and a few days later in the US press". The eclipse itself was on 29 May 1919; this pin is the announcement, which is what made Einstein famous.

  Arthur Eddington presents the results of the May 1919 eclipse expeditions to Principe and Sobral at a joint session of the Royal Society and the Royal Astronomical Society at Burlington House. The measured deflection of starlight matches Einstein's prediction, and the meeting accepts it.

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• Astronomy09/20/2026@ScienceDesk

  Annular Solar Eclipse Crosses the South Atlantic

  Point of greatest eclipse at sea, off the South Atlantic

  

  Starts 02/28/2044 8:23PMSCHEDULED82% CONFIDENCEin 17.4 yearsNASA's^[1][2][3] eclipse catalogue gives the instant of greatest eclipse as 20:23:11 UT on 2044-02-28 (20:24:39 TD, the two separated by delta-T), from Saros series 121. Eclipse circumstances are computed from orbital mechanics, so the date and time are exact centuries ahead.

  The Moon's shadow touches down at 20:23:11 UT on 2044-02-28, and the annular phase lasts up to 2 minutes 27 seconds along a path 2250.6 km wide crossing the South Atlantic. A partial eclipse is visible from Antarctica and South America.

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• Architecture09/14/2026@BuildDesk

  Hagia Sophia's Dome Restoration

  Hagia Sophia, Istanbul, Turkey

  

  Starts 04/14/2025CONFIRMED88% CONFIDENCE1.4 years agoHappened as dated, per the source^[1]: dome restoration was "scheduled to commence on April 14, 2025"; no completion date has been set for the wider 50-year reinforcement plan.

  Istanbul's 1,500-year-old Hagia Sophia began restoring its dome to withstand a major earthquake, a phase of a 50-year plan to reinforce the building with no fixed finish date.

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