SUMMERY: During the northern hemisphere summer of 2020,Jupiter and Saturn will become visible in our evening skies. Earth will approach closest to both these gas-giant planetsin July–something astronomers call planetary opposition. By autumn, the 2 planets will appear to be on a slow collision course with each other in the constellation Sagittarius. But it’s in December that this very close alignment of Jupiter and Saturn reaches its culmination. [source]
A great conjunction is a conjunction of the planets Jupiter and Saturn. Great conjunctions occur regularly (every 19.6 years, on average) due to the combined effect of Jupiter’s approximately 11.86-year orbital period and Saturn’s 29.5-year orbital period.
The September 1859 geomagnetic storm (also known as the Carrington Event) was a powerful geomagnetic storm during solar cycle 10 (1855–1867). A solar coronal mass ejection (CME) hit Earth’s magnetosphere and induced the largest geomagnetic storm on record on September 1–2, 1859. The associated “white light flare” in the solar photosphere was observed and recorded by British astronomers Richard C. Carrington and Richard Hodgson. [source]