NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2022 Feb 23, 08:11 -0800
Robert H. van Gent, you wrote:
"The IAU constellation boundaries were actually established in epoch 1875.0 coordinates, not 1925.0 coordinates, not 1925.0 coordinates"
Oh, thank you! Now I'm glad I posted my graphic, despite being marginal for celestial navigation. I remember reading, more than twenty years ago, that the constellation boundaries were defined by epoch 1875 coordinates and thinking "well of course not... that must be an error... they meant 1925". Now it makes some sense: as noted in the references Delporte, working in the 1920s, was trying to maintain partial consistency with the earlier boundaries, published by Gould in 1877, for southern hemisphere constellations, and that's we he used 1875 coordinates across the whole celestial sphere.
Frank Reed
