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[[17th centuryCentury|1604]] – The [[supernova]] now called "Kepler's nova" is first sighting in the constellation "Ophiuchus." Its observation inspired Johannes Kepler to later write "The New Star" in 1606. <br>[[19th centuryCentury|1871]] – Slash-and-burn land management, months of drought, and the passage of a strong cold front cause the [[wikipedia:Peshtigo fire|Peshtigo Fire]], the [[wikipedia:Great_Chicago_Fire|Great Chicago Fire]], and the [[wikipedia:Great_Michigan_Fire|Great Michigan Fires]] to break out. <br>
[[1958]] – The first internal [[heart]] pacemaker is implanted by Dr. Åke Senning, at the Karolinska Institute of Stockholm. The device, a [[prototype]], only worked for 3 hours. <br>
