What Causes a ‘Day’ and How Is It Measured Exactly?

The Earth spins like a top, and when it turns, we see the Sun rise in the morning and set at night. A day is measured by how long it takes for the Earth to make one full spin, about 24 hours. If you imagine the Sun moving across the sky like a clock, that’s how we count our days.

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Examples

When you wake up in the morning, it's because the Earth has turned so that your part of the planet faces the Sun.
Imagine the Earth as a spinning plate, when it turns, we see different parts of it, like the Sun rising and setting.
Your mom checks the clock at noon to know if it’s time for lunch, that’s a solar day!

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Categories: Science · earth rotation,solar time,day measurement,astronomy,timekeeping