Editing 1973 (section)

===April===
{{main|April 1973}}
* [[April 1]] 
**India launches the wildlife conservation program [[Project Tiger]].  
**Value Added Tax (VAT) is introduced in the United Kingdom.<ref>{{Cite web |last=Victor |first=Adam |date=2010-12-31 |title=VAT: A brief history of taxation |url=http://www.theguardian.com/money/2010/dec/31/vat-brief-history-tax |access-date=2021-01-17 |website=The Guardian |language=en}}</ref>
* [[April 3]] – The first handheld [[mobile phone]] call is made by [[Martin Cooper (inventor)|Martin Cooper]] of [[Motorola]] in New York City.<ref>{{cite web |title=Mobile phone inventor made first call 50 years ago |url=https://www.bbc.co.uk/news/technology-65112048.amp |website=BBC News |access-date=3 April 2023 |date=3 April 2023}}</ref>
* [[April 4]] — The [[World Trade Center (1973–2001)]] was officially dedicated.<ref>{{Cite web |title=Today Marks 42nd Anniversary of WTC Dedication {{!}} National September 11 Memorial & Museum |url=https://www.911memorial.org/connect/blog/today-marks-42nd-anniversary-wtc-dedication |access-date=2025-05-04 |website=www.911memorial.org}}</ref>
* [[April 5]]
** [[Fahri Korutürk]] becomes the sixth president of [[Turkey]].
** ''[[Pioneer 11]]'' is launched on a mission to study the [[Solar System]].
* [[April 6]] – [[Ron Blomberg]] of the [[New York Yankees]] becomes the first [[designated hitter]] in [[Major League Baseball]].
* [[April 7]] – ''[[Tu te reconnaîtras]]'' by [[Anne-Marie David]] (music by Claude Morgan, text by Vline Buggy) wins the [[Eurovision Song Contest 1973]] for [[Luxembourg]]. 
* [[April 10]]
** [[Operation Spring of Youth]]: [[Israel]]i commandos raid [[Beirut]], assassinating 3 leaders of the [[Palestinian political violence|Palestinian Resistance Movement]]. The Lebanese army's inaction brings the immediate resignation of Prime Minister [[Saeb Salam]], a [[Sunni]] Muslim.
** The Islamic Republic of [[Pakistan]] introduced its [[Constitution of Pakistan|new constitution]], its supreme law.<ref>Abiad, Nisrine (2008). Sharia, Muslim states and international human rights treaty obligations&nbsp;: a comparative study. London: British Institute of International and Comparative Law. pp.&nbsp;96–200. {{ISBN|978-1-905221-41-7}}.</ref> 
* [[April 15]] – [[Naim Talu]], a former civil servant, forms the new government of [[Turkey]] (36th government).
* [[April 17]] – The German counter-terrorist force [[GSG 9]]<!-- confirmed here --> is officially formed in response to the [[Munich massacre]].