Silas shifted his gaze to the right. The Night.

In orbit, there was no twilight. There was no lingering orange glow, no purple fade to black. On Earth, the atmosphere bent the light, gifting the surface with twenty minutes of beautiful gloom. Up here, the sun simply ceased to exist. It was like a switch being thrown.

If Earth sat perfectly upright, every place on the globe would experience exactly 12 hours of day and 12 hours of night year-round. However, Earth is tilted at an angle of .

At any given moment, half of the planet is bathed in sunlight while the other half is shrouded in shadow. The moving line that separates these two halves is scientifically known as the terminator or the "twilight zone." Why We Have Seasons (The Tilt)

From space, the night side of Earth reveals the "human footprint" through sprawling webs of artificial light , highlighting our global connectivity. The Transition: Dawn and Dusk