A transit of Venus occurred on 23 May 1526http://en.wikipedia.org/wiki/Transit_of_Venus#Past_and_future_transits
The Roman festival of Rosalia was a festival of roses celebrated in Mayhttp://en.wikipedia.org/wiki/Rosalia_(festival)The Declaration of the Báb took place on May 23, 1844http://en.wikipedia.org/wiki/B%C3%A1b#Declaration_to_Mull.C3.A1_HusaynWorld Turtle Day on the 23rd May http://astronomy.activeboard.com/t49270559/world-turtle-day/
USS Squalus sank during a test dive on 23 May 1939http://en.wikipedia.org/wiki/USS_Squalus_%28SS-192%29
Explorer 1 stopped transmission of data on May 23, 1958 when its batteries diedhttp://en.wikipedia.org/wiki/Explorer_1#FlightThe Vela Hotel 6911 (Vela 10) and Vela 6909 (Vela 9) satellites were launched on May 23, 1969http://en.wikipedia.org/wiki/Vela_(satellite)A Yantar-2K Soviet reconnaissance satellite was launched on May 23, 1974http://en.wikipedia.org/wiki/Yantar-2KThe GOES 9 weather satellite was launched in 1995http://en.wikipedia.org/wiki/GOES_9
The JAXA unmanned balloon BU60-1 reached an altitude record of 53.0 kilometres on May 23, 2002http://www.isas.jaxa.jp/e/special/2003/yamagami/03.shtmlVoyager 1 reached the solar termination shock on May 23 - 24, 2005http://en.wikipedia.org/wiki/Heliosphere#HypothesesThe Fajr Safir 1B was launched on the 23rd May 2012http://en.wikipedia.org/wiki/Iranian_Space_Agency#Safir-1B
Katherine Stinson travels 783 Miles Without a Stop on Her Way from Chicago to New York on May 23, 1918https://postalmuseum.si.edu/airmail/pilot/pilot_female/pilot_female_stinsons.html
Otto Lilienthal (23 May 1848 - 10 August 1896) was a German pioneer of aviationhttp://en.wikipedia.org/wiki/Otto_LilienthalBruce Peterson (May 23, 1933 - May 1, 2006) was a test pilot for NASA http://en.wikipedia.org/wiki/Bruce_PetersonThomas Arthur Reiter (born 23 May 1958) is a retired European astronauthttp://en.wikipedia.org/wiki/Thomas_ReiterJames A. "Jim" Chamberlin (May 23, 1915 - March 8, 1981) was a Canadian aerodynamicisthttp://en.wikipedia.org/wiki/Jim_ChamberlinDr. H. Paul Shuch (May 23, 1946) is an American scientist and engineer http://en.wikipedia.org/wiki/H._Paul_ShuchJohn Bardeen (May 23, 1908 - January 30, 1991) was an American physicist and electrical engineerhttp://astronomy.activeboard.com/t49270579/john-bardeen-1908-1991/Prahalad Chunnilal Vaidya (May 23, 1918 - March 12, 2010), was an Indian physicist and mathematicianhttp://en.wikipedia.org/wiki/Prahalad_Chunnilal_VaidyaEngelbert Schücking (23 May 1926 - January 5, 2015) was a physics professor at New York University http://en.wikipedia.org/wiki/Engelbert_Sch%C3%BCckingFranz Anton Mesmer (May 23, 1734 - March 5, 1815) was a German physician with an interest in astronomyhttp://en.wikipedia.org/wiki/Franz_MesmerAlexander Nikolayevich Vyssotsky (23 May 1888 - December 31, 1973) was an astronomer. http://en.wikipedia.org/wiki/Alexander_VyssotskyManuel John Johnson (23 May 1805 - 28 February 1859) was a British astronomer.http://en.wikipedia.org/wiki/Manuel_John_Johnson
Lucy-Ann Adams McFadden (born 23 May 1952) is an American astronomer.https://en.wikipedia.org/wiki/Lucy-Ann_McFaddenJohnny Ball (born 23 May 1938) is a British television personalityhttp://astronomy.activeboard.com/t49270596/johnny-ball/
Men in Black 3 is an American 3D science fiction comedy film, released on May 25, 2012http://en.wikipedia.org/wiki/Men_in_Black_3
NGC 5612 was discovered by British astronomer John Herschel on the 23rd May 1835. http://astronomy.activeboard.com/t57642827/ngc-5612/NGC 5796 was discovered by German astronomer Ernst Wilhelm Leberecht Tempel on the 23rd May 1884. http://astronomy.activeboard.com/t57642819/ngc-5796/
Messier 7 was catalogued by Charles Messier on May 23, 1764.http://astronomy.activeboard.com/t28469270/messier-7/Charles Messier catalogued the Lagoon Nebula (Messier 8) on May 23, 1764. (Discovered by Giovanni Hodierna before 1654)http://en.wikipedia.org/wiki/Lagoon_Nebula
On May 23, 2010, Berto Monard discovered the +16 magnitude, supernova 2010dahttp://en.wikipedia.org/wiki/NGC_300#SN_2010da
Asteroid (42) Isis was discovered by N.R. Pogson on May 23, 1856, at Oxford.http://astronomy.activeboard.com/t30714341/asteroid-42-isis/
The North and South Omega-Scorpiids are active from the 23rd May to the 15th June. ZHR=5https://www.universeguide.com/meteorshower/southomegascorpiids
MeteoritesThe Gopalpur (H6) meteorite fell in Rajshahi, Bangladesh, on the 23rd May, 1865.http://astronomy.activeboard.com/t49270499/gopalpur-meteorite/The Pavlodar (H5) meteorite fell in Pavlodar, Kazakhstan, on the 23rd May, 1938.http://astronomy.activeboard.com/t49270504/pavlodar-meteorite/The Madhipura (L) meteorite fell in Bihar, India, on the 23rd May, 1950.http://astronomy.activeboard.com/t49270513/madhipura-meteorite/