Why do some annotations appear below the horizon or behind land objects?
The annotations are created using a mathematical model which doesn’t take account of the horizon (or objects near the horizon, such as mountains, buildings, trees, etc), so some stars are annotated even though they are not visible in the photograph. 4.2. Why are some photographs not annotated? In many cases, it’s because I’m lazy and haven’t gotten around to annotating several photographs, though I hope to do this soon. 5. Miscellaneous 5.1. What is the absolute limiting magnitude on these photographs? It varies per photograph, but 7th magnitude stars are visible in most of the better photographs, and 8th magnitude stars are visible in some of the photographs. I believe I’ve seen blue stars with visual magnitudes as high as 9.0 in one or two of the photographs– but it’s quite possible that I’m just imagining this. 5.2. Where did you get the data for stellar positions? From “The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)” 5.3. What equipment did you use to take these
