A dataset consisting of Ca II & H-alpha images taken at the Paris Meudon Observatory. Synthetically generated cloud coverage has been applied to clean images, thereby creating an (cloudy, clean) pair-
Reference material such as mathematical tables and computational aids created by and/or used by staff in the course of their astronomical work at the Sydney Observatory.
Visualization 1 Caption: Time lapse video of antisolar twilight development. Field of View (FOV) of each frame is 118° x 69°. The view is westward over the Pacific Ocean and it was cold and clear at s