‘How long is a day on Venus? More than… a year’

Venus is the second planet from the Sun in our Solar System. Recent detailed studies have allowed us to accurately determine the length of a day on this planet. This was not previously known precisely because Venus is shrouded in clouds, which make observation difficult, and moreover, Venus rotates incredibly slowly.

When we talk about a “day,” we mean exactly an astronomical day. This is the time during which the planet completes a full rotation around its own axis. In the case of Earth, it is commonly assumed to be 24 hours, but it is actually precisely 23 hours, 25 minutes, and 4.091 seconds. And what about Venus?

A day on Venus lasts 243.0228 Earth days. That’s 2/3 of a year on our planet.

So how long does a year on Venus last, which is the period during which the planet completes a full cycle of movement around the Sun? We have known this for a long time – it’s 225 Earth days. That’s right. A year on Venus is shorter than a day!


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