Caelum is number 81 on the size scale and is best visible in December to January at latitudes 41°N to 90°S.

Canes Venatici

Canes Venatici is a two-star constellation while being the 38th largest constellation in the night sky.

Variable Stars

Variable stars are stars that range in size and brightness and temperature. As they cool, they also shrink and dim. Meanwhile, as variable stars heat up, they expand and brighten. One example of variable stars is Betelgeuse in Orion.