Hi! We are the Besselian Elements Team and you will find here information about calculations, upcoming eclipses and our goal of measuring the solar radius using the flash spectrum.
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 »
We aim to measure the photospheric radius of the Sun by recording an accurately timestamped video of the eclipse flash spectrum. The simplest way to add timestamping to
The GPS Timing Device Read more »
Solar eclipses come in various forms, when classified based on their appearance and evolution over the Earth’s surface. We have total eclipse, annular eclipses and partial eclipses. And
The 2023 annular-total solar eclipse: a geographical and meteorological overview Read more »
We are probably all familiar with the spectrum of solar light. Its most spectacular natural manifestation is probably the rainbow. Small rain droplets from a distant storm illuminated
The flash spectrum: an introduction Read more »
Dependency on the value of the solar radius of eclipse duration (2017 August 21st total solar eclipse – from Vale, Oregon) The value of the solar radius at
The solar radius and its impact on eclipse computations Read more »
This article provides the description of an experimental technique to accurately time internal contacts, applied to the Total Solar Eclipse of Nov 3rd 2013.
