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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