#Eclipse

A celestial phenomenon where one astronomical body passes into the shadow of another, capturing global attention and generating mass participation in real-time natural wonder.

Quick Facts

Origin Story

#Eclipse emerged in January 2009 during an annular solar eclipse visible across parts of Africa and Asia. As Twitter gained international traction, users shared observations, photos, and real-time reactions. The hashtag provided a way to experience a geographically-limited event communally—if you couldn’t see the eclipse yourself, #Eclipse let you witness it through others.

Unlike most astronomical hashtags, #Eclipse was inherently democratizing. You didn’t need a telescope or special equipment (beyond eclipse glasses for solar eclipses). Millions could participate simultaneously. This mass-participation aspect made #Eclipse uniquely powerful among astronomy tags.

The hashtag’s potential became clear during the May 20, 2012 annular eclipse visible across Asia and western United States. Millions posted crescent shadows through pinhole viewers, ring-of-fire photos, and their children’s reactions. #Eclipse demonstrated how social media could turn an astronomical event into a shared cultural moment.

But nothing prepared the internet for August 21, 2017—the “Great American Eclipse.” The first total solar eclipse to cross the continental United States in 99 years became the most-photographed, most-shared natural event in human history. Over 12 million people traveled into the path of totality. Tens of millions posted photos, videos, and reactions under #Eclipse. The hashtag trended globally for days.

The 2017 eclipse established a template: NASA and science institutions provided countdown coverage; local tourism surged along the path; eclipse glasses sold out nationwide; communities hosted viewing parties; and #Eclipse became the central hub for millions experiencing totality. Social media transformed a celestial event into a participatory cultural festival.

Timeline

2009-2011

• January 2009: First #Eclipse uses during annular eclipse
• Lunar eclipses begin driving periodic hashtag spikes
• Astronomy educators use hashtag for eclipse education
• Photography communities share eclipse imagery

2012-2015

• May 2012: Annular eclipse across Asia/western US boosts engagement
• Multiple partial and total lunar eclipses (“blood moons”) trend
• Growing anticipation for 2017 total solar eclipse in US
• Eclipse chasing becomes visible subculture

2016-2017

• Indonesia total eclipse (2016) creates regional phenomenon
• August 21, 2017: Great American Eclipse becomes global event
• Record-breaking social media engagement—~40M posts
• Millions travel to path of totality, document experience
• #Eclipse becomes template for participatory astronomy events
• Eclipse photography reaches mainstream audiences

2018-2020

• Post-2017 eclipse nostalgia and “next eclipse” anticipation
• July 2019 South American total eclipse generates regional excitement
• December 2020 eclipse visible from South America
• Growing commercial eclipse tourism industry

2021-2023

• Antarctica eclipse (December 2021) reaches limited audience but dramatic footage
• Multiple lunar eclipses maintain hashtag visibility
• April 2024 North American eclipse preparations intensify
• Eclipse simulation and path-tracking apps proliferate

2024-Present

• April 8, 2024: Total solar eclipse crosses North America
• Path includes major population centers (Dallas, Cleveland, Montreal)
• Becomes most-viewed eclipse in history (~50M in path)
• #Eclipse reaches unprecedented engagement levels
• Next major US eclipse: 2044-2045 (20+ year wait)

Cultural Impact

#Eclipse transformed celestial events from scientific observations into mass cultural experiences. The hashtag turned eclipses into participatory festivals where millions became amateur astronomers for a day. This democratization made astronomy accessible to people who would never visit an observatory.

The 2017 Great American Eclipse demonstrated social media’s power to amplify wonder. The collective experience—millions simultaneously watching the moon cover the sun—created genuine communal awe in a fragmented digital age. #Eclipse became a rare moment of shared, non-political, purely joyful experience.

The hashtag revolutionized eclipse education. Instead of dry textbook explanations, people learned by seeing thousands of photos, videos, and first-hand reactions. The phenomenon became tangible through social media in ways traditional education couldn’t achieve. NASA’s livestreams under #Eclipse reached audiences far beyond typical science programming.

#Eclipse created economic phenomena. Cities in the path of totality saw tourism booms. Eclipse glasses became a commodity. Hotels booked years in advance. Small towns prepared for population surges. The hashtag made eclipses economically significant beyond scientific value.

The tag also preserved eclipse experiences for history. Previous generations’ eclipse memories lived in scattered photo albums. #Eclipse created a searchable, collective archive of human reactions to celestial wonder—children’s amazement, adults crying at totality’s beauty, impromptu celebrations. This documentation had anthropological value.

Notable Moments

• Great American Eclipse (August 21, 2017): First total eclipse across continental US in 99 years; most-shared eclipse in history
• Eclipse Proposal Videos (2017): Dozens of marriage proposals during totality went viral
• Animal Reactions (2017): Videos of confused animals during eclipse fascinated millions
• Bonnie Tyler “Total Eclipse” Performance (2017): Singer performed her hit during totality on cruise ship—perfectly absurd viral moment
• Failed Eclipse Glasses (2017): Counterfeit glasses scare prompted safety warnings under hashtag
• April 2024 Eclipse (April 8): Path through major population centers created largest in-person viewing in history

Controversies

Eclipse glasses safety: Counterfeit and damaged eclipse glasses created genuine safety risks. The hashtag became venue for urgent warnings about permanent eye damage, but also misinformation about viewing safety.

Tourism overwhelm: Small towns in eclipse paths faced infrastructure challenges—traffic gridlock, emergency service strain, housing shortages. Some residents resented the disruption, creating local backlash visible under #Eclipse.

Indigenous perspectives: Some Native American communities viewed eclipses as sacred events requiring specific protocols, raising questions about mass tourism and commercialization. The hashtag occasionally hosted these cultural tensions.

Climate denial intersection: Some conspiracy theorists used #Eclipse to spread unrelated disinformation, including claims about government weather control or biblical prophecy. Scientists constantly corrected misinformation under the tag.

Access inequity: Eclipse glasses and travel to totality paths represented privilege barriers. Discussions emerged under #Eclipse about who gets to experience these events versus who’s excluded by geography or economics.

Photography obsession vs. experience: Debates arose about people experiencing totality through phone screens rather than directly. Was #Eclipse documentation enhancing or replacing genuine wonder?

Environmental impact: Mass travel for eclipse viewing created significant carbon footprints, prompting environmental critiques of “eclipse tourism” under the hashtag.

Variations & Related Tags

• #SolarEclipse - Specifically solar eclipses
• #TotalEclipse - Total solar eclipse events
• #Eclipse2017 - Great American Eclipse specific
• #Eclipse2024 - April 2024 North American eclipse
• #LunarEclipse - Moon eclipses (less dramatic but more common)
• #BloodMoon - Total lunar eclipse appearance
• #PathOfTotality - Total eclipse visibility region
• #EclipseGlasses - Safety equipment
• #EclipseChaser - Eclipse tourism enthusiasts
• #Umbra - Total eclipse shadow region

By The Numbers

• Twitter/X posts (all-time): ~350M+
• Instagram posts: ~180M+
• Peak single-day volume: ~45M (August 21, 2017)
• April 2024 eclipse posts: ~60M+ (over event week)
• YouTube eclipse videos: ~100M+ views (2017 eclipse)
• TikTok videos (2024): ~25B+ views
• Most-photographed natural event in history (2017)
• Estimated in-person viewers (2024): ~50M people

References

• NASA eclipse archives and educational materials
• American Astronomical Society eclipse safety documentation
• Tourism economics research on eclipse events
• Academic studies on mass participation in astronomical events
• Social media analytics from major eclipse events

Last updated: February 2026 Part of the Hashpedia project — hashpedia.org