Meet John Irwin
Eclipse calculation guru
About me
My eclipse passion started in 1999 after a rainy one in Cornwall. I specialize in celestial mechanics computations, with expertise in positional astronomy, astrodynamics, and ephemerides. To support my scientific research and 3D computer graphics work, I’ve developed software programs such as EclipseView, LimbView, and SkyWare.
My personal site
I have a personal website with some of my studies related to eclipses, transits and occultations Eclipse Projects
You can find a couple of them illustrated below
This study illustrate the three-dimensional structure of the Moon’s shadow and its relationship with the smooth-limb shadow cone. The true shape of the shadow is due entirely to the rugged nature of the lunar surface and is especially interesting in the region of the smooth cone apex, as we shall see for three particular solar eclipses, two of which were visited by airborne observers.
This page contains video files with 3D animations of various contemporary solar eclipses depicting the evolution of the shadow cone outlines on the surface of the Earth generated with EclipseView and SkyWare.
thre 3rd edition of the Eclipse catalog, from Jan -13000 to Jan +17000, with Polynomial coefficients for more than 70000 solar eclipses and lunar eclipses.