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 from a simple
The Eclipse Countdown App Is Now Available on the App Store and Google Play Read more »
At Besselian Elements, our focus has always been the “science of the shadow”, providing the most rigorous data possible by accounting for the real lunar limb and Earth’s
Besselian Elements Collaboration with Eclipsefan Read more »
New in the app: a live Weather page for the August 12, 2026 eclipse in Spain With few days left before the total solar eclipse crosses Spain, one
A live Weather page in our Eclipse Countdown App Read more »
From Leuven to Spain: how our collaboration with TotalControl began In June 2025 we found ourselves in Leuven, Belgium, for the Solar Eclipse Conference hosted in Leuven Home
The IQP Engine Inside TotalControl: Precision Timing for Eclipse Photography Read more »
Eclipse predictions are based on several inputs: the position of Sun, Moon and Earth, the topography of the lunar limb, the topography of Earth’s surface, the size of
Eclipse predictions need to be periodically updated Read more »
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 eclipse maps (https://www.besselianelements.com/eclipse-maps/)
Eclipse Limits and Centreline are jagged lines Read more »
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, between about 4°
2026 Solar Eclipse in Spain: Real Sky Conditions from Weather Webcams Read more »
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 Spain, the challenge
Average cloud cover over Spain considering cloud shadows Read more »
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 obstruct the view.
Which clouds can ruin your eclipse view Read more »
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, it remains as
Re-Entrant Totality Read more »
Capturing the flash spectrum during a solar eclipse offers invaluable insights into the Sun’s outer layers like the chromosphere and the mesosphere. To harness this data, it is
Flash Spectrum video analysis with Python Read more »
Capturing the flash spectrum during a solar eclipse, with not professional equipment, is as challenging as it is rewarding. To help you get the best results, we’ve compiled a guide based on
Flash Spectrum Recording Guidelines Read more »
A remarkable observation The following post by Jillian Culver on the Solar Eclipse Chasers Facebook page caught our attention as it describes, rather in detail, an intriguing observation
A Prolonged Observation of the Outer Corona from Outside the Path of Totality Read more »
Several online sources provided eclipse maps for the 2024 April 8th total solar eclipse. All these maps show the location of the umbral shadow path limits. Close inspection
Experimentally Testing Eclipse Maps Accuracy Read more »
The “rule” The following empirical “rule” to determine the hemisphere of visibility of a total solar eclipse was recently mentioned on the Solar Eclipses Mailing List (SEML): To
Total solar eclipse hemisphere of visibility: an empirical “rule” and why it works Read more »
Many observers in Northern Texas, and elsewhere, reported that cloud cover decreased on the lead up to totality during the recent total solar eclipse. Some places started with
Effect of Eclipse Cooling on Clouds: a demostration Read more »
Technical Details of the true-limb Eclipse Path Determination Much interest has been generated by the precise map of the path of the 2024 April 8th Total Solar Eclipse
Technical Details of the true-limb Eclipse Path Determination Read more »
Path of the 2024 April 8th Total Solar Eclipse – by John Irwin The position of the umbral shadow path across North America has been accurately determined by
Path of the 2024 April 8th Total Solar Eclipse Read more »
The naked eye view of the eclipse from at the limit of the umbral shadow
Eclipse from the edge Read more »
The average time span between totalities from a given place is ca. 375 year, with a minimum just under 6 months and the longest and maximum of ca.
Time span between totalities from a given place Read more »
Flash spectrum videos have been successfully used to estimate the solar radius JOA2022_2.pdf (iota-es.de) and the same methodology offers the possibility to probe the distribution of elements in the chromosphere. During
Elements distribution in the chromosphere from a flash spectrum video Read more »
IERS has just announced that no leap second will be inserted into UTC at the end of December 2022 (https://datacenter.iers.org/data/latestVersion/16_BULLETIN_C16.txt). The number of inserted leap seconds (since the
Leap second, dUT1 and future eclipses Read more »
The chromosphere, as seen in many eclipse images and video, appears intensely white in its lowermost layers and then has a characteristic purplish pink hue for most of
Why is the chromosphere purple? Read more »
Descriptions of total solar eclipses observed from the very edge of the path of totality are few and far between. So we would like to share our experience
Coronality vs Totality: Total Solar Eclipses from the edge Read more »
