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April

Born on this day

David Rittenhouse

David Rittenhouse (April 8, 1732 – June 26, 1796) was a renowned American astronomer, inventor, clockmaker, mathematician, surveyor, scientific instrument craftsman and public official.

15th week in year

8 April 2024

Important eventsBack

1st orbiting astronomical observatory, launched8.4.1966

Wikipedia (14 Mar 2013, 09:54)

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The first OAO was launched successfully on 8 April 1966, carrying instruments to detect ultraviolet, X-ray and gamma ray emission. Before the instruments could be activated, however, a power failure resulted in the termination of the mission after three days.

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