1961 - Venera program: Venera 1 becomes the first manmade object to fly-by another planet by passing Venus (however the probe had lost contact with earth a month earlier and did not send back any data).
... in the Western Hemisphere
William Baffin, (1584-1622), explorer
Willem Barents, (1550?-1597), Dutch, died on Nova Zembla seeking the Northeast Passage[?]
...