* Astronomy

A total solar eclipse occurred on June 30, 1973. 
This eclipse was observed by a group of scientists from the Los Alamos National Laboratory using two airplanes to extend the apparent time of totality by flying along the eclipse path in the same direction as the Moon's shadow as it passed over Africa. One of the planes was a prototype of what later became the Concorde, which has a top speed of almost 2,100 km/h. This enabled the scientists to experience a period of totality that lasted more than 74 minutes, nearly 10 times longer than is possible when viewing a total solar eclipse from a stationary location.
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