Space
Astronauts on the International Space Station see about 16 sunrises every day.
The station circles Earth roughly every 90 minutes at about 28,000 kilometres per hour. Each orbit brings a sunrise and a sunset.
Why is this true?
Crews keep to a schedule set to Coordinated Universal Time and use window shutters and dimmed lighting to keep a normal sleep rhythm. The ISS has been continuously occupied since November 2000.
More facts in this category
More about space
Space facts are mostly a lesson in scale. Days longer than years, storms wider than Earth, light that left its star before the pyramids existed — the numbers stop being intuitive very quickly. Every entry here comes from established astronomy and includes a short explanation of what causes the effect, so the fact holds up when someone asks the obvious follow-up question at the dinner table.
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