When a telescope or astronomical instrument is first used to take an image after construction.

n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.

The first lighting of the sky after night and before dawn when the stars begin to dim. Surfers first check the waves at this time.