This last phase of twilight concludes once the sun drops below 18 degrees; the sky becomes fully dark, and astronomers can enjoy the beginning of their work night. Of course, this is all for dusk ...

It’s much harder to pull off, but by scanning parts of the sky at dusk, astronomers have been able to find key asteroids they ... But by braving twilight, asteroid hunters have been able to ...

Civil Twilight is after dawn and before dusk, classified as the time where the sun is five degrees or less below the horizon. Many astronomers say that the total eclipse resembles civil twilight.