Cassiopeia is observable in the autumn and winter throughout the Northern Hemisphere. It lies opposite the Sun in early October. And if your location on Earth is at 46° north latitude or higher ...

And if your location on Earth is at 46° north latitude or higher, this constellation is circumpolar, meaning that it will never set. Among the 88 official constellations, Cassiopeia ranks as the ...

NGC 7023, also known as the Iris Nebula, is a reflection nebula in the constellation Cepheus. It's a bright nebula that's visible in the northern sky.