Total eclipse of the Internet: traffic impacts in Iceland, Spain, and Portugal
A total solar eclipse over Iceland, Spain, and Portugal on August 12 caused a measurable drop in Internet traffic, with regions under the deepest shadow seeing declines of up to 30% as people paused online activity to observe the event.
On August 12, a total solar eclipse crossed Iceland, northern Spain, and Portugal, with deep partial coverage across Western Europe near sunset. Cloudflare Radar tracked HTTP request volumes in five-minute intervals, comparing them to a normal-day baseline. Traffic fell sharply in countries under the path of totality and deepest partial eclipse, with the largest declines aligning precisely with the moment of maximum obscuration. The decreases were most pronounced in Iceland, Spain, and Portugal, where traffic dropped by roughly 15% to 30%. Regions with minimal eclipse coverage, such as Sweden and Denmark, saw little to no change in online activity.
A scatter plot of peak solar obscuration versus traffic dip confirmed a strong inverse relationship: deeper eclipses corresponded to larger traffic reductions. The data showed a consistent downward trend, with traffic troughs mirroring the eclipse’s progression and rebounding within minutes as the sun reappeared. Local factors like population density and cloud cover introduced minor variations, but the overall pattern remained clear. The eclipse’s timing and the immediate normalization of traffic afterward ruled out random fluctuations as an explanation.
Country-level trend lines further illustrated the eclipse’s impact, with traffic deviations ranging from -9.3% to -46.7% in affected regions. The analysis compared August 12 to the median of the three preceding Wednesdays to isolate the eclipse’s effect, ensuring the baseline excluded atypical weekly variations. The methodology accounted for obscuration levels by calculating the geometric overlap of the sun and moon every five minutes, providing precise measurements of eclipse depth and timing.
The findings highlight how major physical events can temporarily reshape digital behavior, with Internet traffic serving as a real-time reflection of human attention. As the eclipse passed, online activity slowed not due to technical failures but because people stepped away from their devices to witness the phenomenon. The data offers a snapshot of how shared experiences can momentarily realign online engagement across an entire continent.