Final answer:
A constellation whose diurnal circle is close enough to a celestial pole that is visible all year round is called a circumpolar constellation. These constellations, such as the Big Dipper and Cassiopeia, circle around the pole star and are always above the horizon for certain latitudes.
Step-by-step explanation:
A constellation whose diurnal circle is close enough to a celestial pole that it is visible all year round is called a circumpolar constellation. This term describes constellations near the celestial poles that do not rise or set but instead can be seen to circle the poles and are always above the horizon when viewed from certain latitudes. Constellations on the ecliptic, however, are those through which the Sun appears to move during the course of a year and are different from circumpolar constellations. It's interesting to note that such circumpolar constellations as the Big Dipper and Cassiopeia remain visible throughout the night, rotating around the pole star, and due to their proximity to the celestial pole, they do not dip below the horizon and are therefore visible all year round from the appropriate latitudes.