A Venusian day is 243 Earth days long — longer than the planet’s entire 225-day year — and because Venus rotates backwards, the Sun would rise in the west and set in the east, though only once every 117 Earth days through its thick, cloud-choked sky.

Venus spins once every 243 Earth days, longer than its 225-day year, and backwards. But sunrise to sunrise takes only about 117 Earth days, because the orbital motion and slow retrograde spin pull against each other. And through its opaque clouds, a sunrise is really a slow, diffuse glow. The post A Venusian day is 243 Earth days long — longer than the planet’s entire 225-day year — and because Venus rotates backwards, the Sun would rise in the west and set in the east, though only once every 11