Which celestial event triggered the highest-grossing marketing campaign for astronomy retailers in the last decade, resulting in a 300% increase in telescope sales?

The astronomy industry has seen some remarkable marketing campaigns that have captured public imagination and boosted telescope and stargazing equipment sales. From lunar landing anniversaries to major celestial events, astronomy retailers have leveraged these moments with creative campaigns to drive consumer interest. This trivia question focuses on one of the most successful retail marketing campaigns in the astronomy industry's recent history.

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The 2017 Total Solar Eclipse across the United States
The 2018 Mars Close Approach
The 2019 Apollo 11 Moon Landing 50th Anniversary
The 2020 Great Conjunction of Jupiter and Saturn