REDEFINING THE SOLAR RADIUS
Besselian Elements Team
Your guide to Solar Eclipses
Eclipse Maps
Display local circumstances computed using the IQP eclipse computational method that accounts for both the lunar limb, observer site topography, and it relies on an improved value for the eclipse solar radius (i.e. 959.95")
Eclipse App
Download our Countdown App to plan and observe your next eclipses powered by the most accurate computational method
Solar Radius Calculation
Read about our misson to determine the best solar radius value for eclipse computations by analyzing the flash spectrum, especially from the path edge. This improves eclipse maps and predictions
Who we are
We are the Besselian Elements Team, passionate eclipse chasers and researchers. We provide accurate eclipse calculations and share our work studying these awe-inspiring phenomena
Eclipse Limits and Centreline are jagged lines
The eclipse limits of the umbral shadow path of a total solar eclipse are traditionally depicted as smooth lines on a map. Inspection of our ...
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The Eclipse Countdown App Is Now Available on the App Store and Google Play
We’re excited to announce the official launch of Eclipse Countdown app, now available on both the App Store and Google Play. This app was born ...
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2026 Solar Eclipse in Spain: Real Sky Conditions from Weather Webcams
The solar eclipse next year will be visible from Spain around 8:30 pm local time—very close to sunset. That means the Sun will be low, ...
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Average cloud cover over Spain considering cloud shadows
https://view.eumetsat.int/ Jul 31 18:10 UTC Eumetview Weather is always a critical factor when observing a total solar eclipse. For the August 12, 2026 eclipse in ...
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Which clouds can ruin your eclipse view
When observing a low-altitude solar eclipse, like the one that will occur in Spain on August 12, 2026, it is possible for distant clouds to ...
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Re-Entrant Totality
Is it possible for totality to be disrupted? The common understanding of total solar eclipses is that when the eclipse becomes total at second contact, ...
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Publications
