Blue-Ozone Fringe on the Umbra Edge

This photo shows the Moon during the total lunar eclipse of September 7, 2025, as seen from Damavand, Iran. The Moon was emerging from totality at around 22:25 IRST, about 40° above the horizon. Along the inner edge of Earth’s umbra, a thin turquoise band can be seen — a phenomenon caused by sunlight refracted through the ozone layer in Earth’s upper atmosphere (Chappuis absorption bands). The reddish hue of the umbra itself is due to Rayleigh scattering removing shorter wavelengths.

Canon 6D (unmodified) DSLR on a 10-inch SkyWatcher Dobsonian GoTo telescope.
All exposures taken at ISO 200.

HDR composite of 5 frames (0.5s, 1/13s, 1/80s, 1/500s, 1/3200s).
Frames aligned on lunar surface features and blended using luminance masks to preserve both bright and dark details. Final color balance calibrated to highlight the ozone turquoise fringe and the red umbral glow.