Hi! We are the Besselian Elements Team and you will find here information about calculations, incoming eclipses and our goal of measuring the solar radius using the flash spectrum.
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: experimental evidence? 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 »
The Earth’s rotational rate is ever changing, due to a series of factors, mainly the effect of tidal friction caused by the Moon and the effect of the
Leap Second: will there be one before the 2023 AT eclipse? Read more »
