New Hampshire Astronomical SocietyApril 2nd in Astronomy and Space Science
 | 1066 | A return of Comet Halley that is visible for 67 days. It is this apparition that was made famous after it was depicted in the Bayeux Tapestry. |
 | 1845 | French physicist H.L. Fizeau & French scientist and inventor J. Leon Foucault take the first photograph of the Sun. |
 | 1963 | USSR launches the Luna 4, an unmanned probe designed to soft-land on the Moon. It misses the Moon by 8500 km (5300 miles). |
| 1964 | The Soviet Zond 1 spacecraft is launched on a Venus fly-by mission. |
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