Thread: Solar Halo
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Old 2020-10-09, 01:37   #7
Dr Sardonicus
 
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I surmised the "special circumstances" might also have included Jupiter being at or near its brightest. So, I looked up its dates of opposition (occurs about every 13 months) in years around 1980.

1976 November 18
1977 December 22
1979 January 24
1980 February 24
1981 March 25
1982 April 22
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