A day on the International Space Station (ISS) is about 90 minutes long.
This means that the astronauts aboard the ISS experience approximately 16 sunrises and sunsets every single day. The station orbits the Earth at a speed of around 28,000 kilometers per hour (about 17,500 miles per hour), allowing it to complete an orbit approximately every 90 minutes.
As a result, the concept of a ‘day’ differs significantly from what we experience on Earth, where one rotation takes about 24 hours. On the ISS, astronauts have to adapt their schedules to this rapid cycle of daylight and darkness, which can influence their sleep patterns and daily activities.