<a href="https://en.wikipedia.org/wiki/Project_Vanguard" id="mw1Q" rel="mw:WikiLink" title="Project Vanguard">Project Vanguard</a>: <a href="https://en.wikipedia.org/wiki/Vanguard_2" id="mw1g" rel="mw:WikiLink" title="Vanguard 2">Vanguard 2</a>: The first <a href="https://en.wikipedia.org/wiki/Weather_satellite" id="mw1w" rel="mw:WikiLink" title="Weather satellite">weather satellite</a> is launched to measure cloud-cover distribution.