1735 - Mathematical calculations suggest that it was on this day that Pluto moved from the ninth to the eighth most distant planet from the Sun for the last time before 1979.
1776 - Captain James Cook begins his third voyage
1781 - Thomas Hutchins designated Geographer of US
1801 - French astronomer Jean-Louis Pons discovers his 1st comet
1921 - Mongolia gains independence from China (National Day)
1975 - Chinese archeologists discover a 3-acre burial site with 6,000 clay statues of warriors dating as early as 221 BC
1979 - US Skylab enters atmosphere over Australia & disintegrates
