I released a new "Day/Night terminator" algorithm as a part of the "Earth, Sun, Moon, & Planets" plugin. I was able to get some help to implement the algorithm that does the work.
https://plugins.qgis.org/plugins/earthsunmoon/ The new algorithm creates vector layers for the day/night terminator line, polygon layers associated with sunrise/sunset, civil twilight, nautical twilight and astronomical twilight, and the position of the sun directly overhead. Since I can't include images, here are some links to images representing the plugin's capabilities. https://drive.google.com/file/d/1oeT6xtLOBkIp5QN2q2FH2bd94V7XRU2Z/view?usp=drive_link https://drive.google.com/file/d/1E1JDBlQGqE9Wi3qs34jNX5IIaYtT4kxw/view?usp=drive_link https://drive.google.com/file/d/148oAwFt7zpL1OChm3GWUq4FtxTckctjr/view?usp=drive_link The "Day/Night terminator" and "Sun position directly overhead" work as is, but the rest of the plugin's capabilities require installing Time Zone Finder and Skyfield (pip install timezonefinder skyfield). Let me know if you encounter any problems. Thanks, Calvin
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