The ninth and final challenge of the 2020 Series will be a 10-day challenge marking the extraordinarily rare astronomical event known as the Great Conjunction. The challenge will be offered on the GFN-18, GFN-19, and GFN-20 subprojects, beginning 21 December 13:22 UTC and ending 31 December 13:22 UTC.
To participate in the Challenge, please select only the GFN-18 and/or GFN-19 and/or GFN-20 subprojects in your PrimeGrid preferences section.
Addendums? Annotations? Apprehensions? Discuss in the forum thread for this challenge. Best of luck!