What is 669.6 Earth days?

669.6 Earth days is like having almost 2 years on Earth.

Imagine you have a giant calendar that shows how long it takes for a planet to go all the way around its star, we call this one full year. On Earth, that takes 365 days, which means if you lived on another planet, and it took 669.6 days to go around its star, that would feel like living in a world where years are longer than ours.

If your birthday is once every year on Earth, then someone who lives on that other planet would have their birthday once every 669.6 days, almost 2 full Earth years! So if you were friends with them, you might only see each other at their birthday party twice as often as you do yours.

Think of it like a slow dance between the planet and its star. The music is slower there, so the dance takes longer, that’s why they have such long years.