the best visibility occurs at 61º02'55" N, 55º28'04" E. It is the 20th solar eclipse of Solar Saros series 149, at ascending node. The Sun is its zenith just 83 km south of the Equator, so the Northern Hemisphere was in winter and the Southern Hemisphere was in summer on March 19, 2007. March 23 – Naval forces of Islamic Revolutionary Guard Corps arrest Royal Navy personnel in disputed Iran-Iraq waters; they were released on April 4. March 25 – A 6.7 magnitude earthquake kills at least one in western Japan. March 27 – Latvian Prime Minister Aigars Kalvītis and Russian Prime Minister Mikhail Fradkov sign a border treaty between Latvia and Russia, officially demarcating the border between the two. April April 16 – Virginia tech massacre: 23 year-old Seung-Hui Cho fatally shot 32 people and injured 17 others. He used two semi-automatic pistols to kill them and killed himself as police arrived on the scene. April 18 – 18 April 2007 Baghdad bombings: A series of attacks take place across Baghdad, Iraq, killing nearly 200 people. April 24 – Gliese 581c, a potentially Earth-like extrasolar planet habitable for life, is discovered in the constellation Libra. April 26–27 – "Bronze Night": Ethnic Russian riot in Tallinn and other cities in Estonia against the moving of the Bronze Soldier of Tallinn, a Soviet World War II memorial statue. 2007 cyberattacks on Estonia begin. May May 10 – As a result of factors including the Blair-Brown pact and falling approval ratings as a result of the Iraq War, British Prime Minister Tony Blair announces his intention to resign as Leader of the Labour Party and Prime Minister, triggering the 2007 Labour Party leadership election, in which Chancellor Gordon Brown ran unopposed. Brown would officially replace Blair as Prime Minister on 27 June. May 10–12 – The Eurovision Song Contest 2007 takes place in Helsinki, Finland, and is won by Serbian entrant Marija Šerifović with the song "Molitva". May 17 – The Russian Orthodox Church Abroad and the Moscow Patriarchate re-unite after 80 years of schism. May 20 – Sheikh Mohammed bin Rashid Al Maktoum of Dubai makes the largest single charitable donation in modern history, committing €7.41 billion to an educational foundation in the Middle East. June June 5 – NASA's MESSENGER spacecraft makes its second fly-by of Venus en route to Mercury. June 27 – Gordon Brown succeeds Tony Blair and