What is circumpolar, when it is visible and what are two circumpolar constellations
http://en.wikipedia.org/wiki/Circumpolar_constellation
http://en.wikipedia.org/wiki/Circumpolar
Circumpolar refers to celestial objects that are constantly visible in the sky throughout the course of the night, as they never dip below the horizon due to the rotation of the Earth. This means that circumpolar objects can be observed from specific latitudes on Earth, typically closer to the poles.
The visibility of circumpolar objects depends on the latitude of the observer. For example, if you are located near the North Pole, then the entire northern celestial hemisphere, including all the circumpolar stars, will be visible all year round. On the other hand, if you are located near the equator, no circumpolar stars will be visible as they will always remain below the horizon.
Two well-known circumpolar constellations are Ursa Major (also known as the Big Dipper) and Ursa Minor (also known as the Little Dipper). These constellations are visible in the northern hemisphere year-round and are easily recognizable due to their distinct patterns of stars.
To learn more about circumpolar constellations and their visibility, you can refer to the links provided. The Wikipedia pages on circumpolar constellations and circumpolar objects provide a wealth of information on this topic.