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In this month: July 2019

5th July 1687 The book Principia is published by Sir Isaac Newton. Written in Latin with the title Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) it is often referred to simply as the Principia. The book contains Newton's laws of motion, Newton's law of universal gravitation and a derivation of Kepler's laws of planetary motion. The Principia is considered one of the most important works in the history of science. 20th July 1969 (or 21st July if you are in Australia) The Eagle has landed! Astronauts Neil Armstrong and Buzz Aldrin from the Apollo 11 NASA space mission landed on the Moon in the Eagle Lunar Module. Neil Armstrong's famous words ""Tha

Solar Observations: May 2019

For the month of May, 2019, though solar activity was once again was still very low, a few Sunspot groups did appear. A total of 24 observations were made with the remaining 7 days either cloud covered or rain. This included 12 days when no Sunspot activity could be seen.Summing up there was a total of two Sunspot groups in the north with a total of 6 Sunspots all in the north.The total average classification value was 16.8 and the relevant total Sunspot number was 9. Due to bad weather no observations were made until the 4th May when a single Hsx spot was observed close to the NE limb with a latitude of plus 4° and longitude of 312° in AR (active region) 1240. This Sunspot became more activ

Did you know? Comets...dirty snowballs

The long and short of it….. the orbital period of comets can range from long period comets like Comet McNaught, 92,700 years, to Comet Encke that zips around the Sun every 3.3 years. Comet Hyakutake holds the record of having the longest tail, at a length of 560 million kilometres. This is almost double the size of the Great Comet of 1843 which previously held the record with a tail of 300 million kilometres. Mary Morton painted this comet (image above) as she saw it from Van Dieman's Land - now called Tasmania. The Rosetta probe was intentionally crashed into Comet 67P/Churyumov-Gerasimenko in order to provide close-up photos on its final descent. The solar-powered spacecraft would not have

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