Which astronomical event triggered the largest single-day sales spike in telescope history for major astronomy retailers?

The astronomy retail sector has evolved dramatically in recent years, with specialty stores and online retailers competing for the attention of amateur astronomers and space enthusiasts. From telescope sales to star-gazing accessories, this market has its own unique trends and notable milestones. Test your knowledge of astronomy retail with this challenging question about one of the industry's most significant sales events.

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2017 Total Solar Eclipse across the United States
Mars Opposition of 2018
2012 Transit of Venus
2020 Great Conjunction of Jupiter and Saturn