6 July
1687: On 6 July 1687, Newton's Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) was published for the frist time. This work is often held to represent the culmination ...
27 FEB. 2004
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1816: On 7 July 1816, Rudolf Wolf was born.
Wolf was a Swiss astronomer and astronomical historian. Wolf's main contribution was the discovery of the eleven-year sunspot cycle. He was also the co-discoverer of its connection with geomagnetic activity on Earth.
In 1849 he devised a system now known as Wolf's sunspot numbers. This system is still in use for studying solar activity by counting sunspots and sunspot groups.
1668: On 7 July 1668, Isaac Newton received his Master's degree from Trinity College at the University of Cambridge, UK.
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5 July
1054: On 5 July 1054, a powerful celestial explosion brightened the summer sky. It was the spectacular explosion of a supernova, the violent death of a star that may have ...
4 July
1910: On 4 July 1910, Giovanni Virginio Schiaparelli died.Schiaparelli was an Italian astronomer who is remembered for his observations of Mars. He named the 'seas' and 'continents' of the Red ...
3 July
2003: On 3 July 2003, ESA's Mars Express spacecraft sent images of a unique view of Earth and the Moon. It was one of the first data sets coming from ...
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