(Astrology) The Sun resides in the constellation Aries from April 18 to May 13http://en.wikipedia.org/wiki/Aries_(constellation)#Astrology
The 1902 Guatemala earthquake struck on April 18, 1902 at 20:23:50 hrs.http://en.wikipedia.org/wiki/1902_Guatemala_earthquakeThe San Francisco earthquake of 1906 struck on Wednesday, April 18, 1906.http://astronomy.activeboard.com/t6647305/san-francisco-quake/
Construction of the present Papal Basilica of Saint Peter, began on April 18, 1506http://astronomy.activeboard.com/t42359108/basilica-papale-di-san-pietro/The University of Alabama opened its doors to students on April 18, 1831http://en.wikipedia.org/wiki/University_of_AlabamaThe Shreveport Observatory was dedicated and officially opened on April 18, 1964.http://en.wikipedia.org/wiki/Ralph_A._Worley_ObservatoryOn this day in 1930... The BBC said there was no newshttp://www.bbc.co.uk/news/entertainment-arts-39633603
Discoverer 39 was launched on the 18th April 1968http://en.wikipedia.org/wiki/Corona_(satellite)#LaunchesKosmos 215 was a Soviet satellite which was launched in 1968http://en.wikipedia.org/wiki/Kosmos_215GSAT-1 communications satellite was launched on the 18th April 2001http://en.wikipedia.org/wiki/GSAT-1
Cygnus spacecraft S.S. John Glenn was launched at 15:11 UT, 18th April 2017https://en.wikipedia.org/wiki/Cygnus_CRS_OA-7
Brian Harold Mason (1917-2009) was a New Zealand born geochemist and mineralogist who was one of the pioneers in the study of meteoriteshttp://astronomy.activeboard.com/t32776735/brian-h-mason-1917-2009/Hugh Longbourne Callendar (18 April 1863 - 21 January 1930) was a British physicist.http://en.wikipedia.org/wiki/Hugh_Longbourne_Callendar
Charles Elachi (born April 18, 1947) is a Lebanese professorhttps://en.wikipedia.org/wiki/Charles_ElachiAlgernon Charles Gifford (18 April 1861 - 27 February 1948) was an astronomer and teacher.http://en.wikipedia.org/wiki/Charles_Gifford_(astronomer)Michel Ory (born 18 April 1966) is an amateur astronomerhttp://en.wikipedia.org/wiki/Michel_OryDavid Tennant (born David John McDonald on 18 April 1971) is a Scottish actor.http://astronomy.activeboard.com/t21897156/david-tennant/
NGC 3224 was discovered by John Herschel on the 18th April 1835.http://astronomy.activeboard.com/t57330998/ngc-3224/NGC 3535 was discovered by William Herschel on the 18th April 1784.http://astronomy.activeboard.com/t57330988/ngc-3535/NGC 4809 was discovered by R. J. Mitchell on the 18th April 1855.http://astronomy.activeboard.com/t57330983/ngc-4809/NGC 4810 was discovered by R. J. Mitchell on the 18th April 1855.http://astronomy.activeboard.com/t57330975/ngc-4810/NGC 5088 was discovered by R. J. Mitchell on the 18th April 1855.http://astronomy.activeboard.com/t57330968/ngc-5088/
Asteroid (98) Ianthe was discovered on April 18, 1868 by C. H. F. Peters in Clinton, New York.http://en.wikipedia.org/wiki/98_IantheThe Nevada Fireball - April 18, 1962http://astronomy.activeboard.com/t53384960/the-nevada-fireball-april-18-1962/The Alpha-Virginids meteor shower peaks around the 18th April.http://astronomy.activeboard.com/t41828279/alpha-virginids-meteor-shower/
MeteoritesThe Akbarpur (H4) meteorite fell in Uttar Pradesh, India, on the 18th April, 1838.http://astronomy.activeboard.com/t48769204/akbarpur-meteorite/The Veramin (Mesosiderite) meteorite fell in Tehran, Iran, on the 18th April, 1880.http://astronomy.activeboard.com/t48769214/veramin-meteorite/The Success (L6) meteorite fell in Arkansas, USA, on the 18th April, 1924.http://astronomy.activeboard.com/t48769223/success-meteorite/The Komagome (Iron) meteorite fell in Kanto, Japan, on the 18th April, 1926.http://astronomy.activeboard.com/t48769232/komagome-meteorite/The Udipi (H5) meteorite fell in Karnataka, India, in April, 1866.http://astronomy.activeboard.com/t57332498/udipi-meteorite/