If you start to think about how these lengths of time are defined it becomes clearer.
1 day = time to rotate on it’s axis once
1 year = time to complete a full rotation around the sun
For Earth, it takes us ~24hrs to rotate on our axis and 365.25 days to orbit the sun.
However, because Venus’ axial rotation is so slow (and another interesting fact, it rotates in the opposite direction to other planets) it actually completes a full orbit of the sun before 1 axial rotation.
Hence, a year is shorter than a day
For those interested:
1 Venus day = 243 earth days
1 Venus year = 225 earth days
Colloquially, most people use “day” to mean how long it takes the sun to get to the same place in the sky. Solar day vs sidereal day, the difference is only about 4 minutes on Earth, but can be much greater elsewhere. Venus’ solar day is about 117 Earth days, so you would see a couple sunrises/sunsets each Venusian year.
A day on Venus is longer than a year on Venus.
If you start to think about how these lengths of time are defined it becomes clearer.
1 day = time to rotate on it’s axis once 1 year = time to complete a full rotation around the sun
For Earth, it takes us ~24hrs to rotate on our axis and 365.25 days to orbit the sun.
However, because Venus’ axial rotation is so slow (and another interesting fact, it rotates in the opposite direction to other planets) it actually completes a full orbit of the sun before 1 axial rotation.
Hence, a year is shorter than a day
For those interested:
1 Venus day = 243 earth days 1 Venus year = 225 earth days
Colloquially, most people use “day” to mean how long it takes the sun to get to the same place in the sky. Solar day vs sidereal day, the difference is only about 4 minutes on Earth, but can be much greater elsewhere. Venus’ solar day is about 117 Earth days, so you would see a couple sunrises/sunsets each Venusian year.
This is the most interesting one I’ve read so far.
Wow! That’s another thing I learned from QI recently. Great fact though, and nice to see it mentioned here 🙂
Really interesting.