1593

January 25 – Siamese King Naresuan, in combat on elephant back, kills Burmese Crown Prince Mingyi Swa on Monday, Moon 2 Waning day 2, Year of the Dragon, Chulasakarat 954, reckoned as corresponding to January 25, 1593, of the Gregorian calendar, and commemorated as Royal Thai Armed Forces Day. January 27 – The Roman Inquisition opens the seven-year trial of scholar Giordano Bruno. February 2 – Battle of Piątek: Polish forces led by Janusz Ostrogski are victorious. February 8 – Siege of Pyongyang (1593): A Japanese invasion is defeated in Pyongyang by a combined force of Korean and Ming troops. February 12 – Battle of Haengju: Korea defeats Japan. March 7 (February 25 Old Style) – The Uppsala Synod discontinues; the Liturgical Struggle between the Swedish Reformation and Counter-Reformation ends in Sweden. March 14 – The Pi Day, giving the most digits of Pi when written in mm/dd/yyyy format, (i.e. 3.141593, 3/14/1593) occurs, as realized later. During 1593 Flemish mathematician Adriaan van Roomen is working on the most accurate calculation of pi up to that time and arrives at 16 decimal places of Pi using the polygon approximation method), and publishes it in his treatise Ideae mathematicae pars prima (Antverpiae, 1593). April 10 – The English Parliament enacts a law for the first military disability pension in British history, titled "An Acte for relief of Soudiours". The Act states that "forasmuch as it is agreable with Christian Charity Policy and the Honour of our Nation, that such as have since the 25th day of March 1588, adventured their lives and lost their limbs or disabled their bodies, or shall hereafter adventure the lives, lose their limbs or disable their bodies, in defence and service of Her Majesty and the State, should at their return be relieved and rewarded to the end that they may reap the fruit of their good deservings, and others may be encouraged to perform like endeavors..." April 18 – Anglo-Spanish War: Naval Battle of Blaye in the Gironde estuary sees a Spanish victory over the blockading English fleet, allowing the Spanish to relieve the French Catholic garrison of Blaye.