I took this photo of sunset on orbit during Expedition-30 to the ISS using a fisheye lens. It takes 7 ½ seconds for the disk of the sun to slip below the horizon. It goes from bright daytime lighting to dark night lighting in about twice this time. There is no extended twilight on orbit. On Earth, it takes 2 minutes for the solar disk to set where our atmosphere, acting as a light buffer, gives extended twilight.

More astrophotography can be found on my Instagram and Twitter accounts.