The constellations along or near the ecliptic, including the constellations of the Zodiac, are visible from most of north and south america. At high latitudes in either direction, the equatorial constellations will be pretty low on the horizon and may not be visible unless the terrain is fairly flat, or from high elevations such as mountain peaks.
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The Southern Cross and the Crux constellation are not visible from North America because they are located in the Southern Hemisphere. Another constellation that may not be visible from North America is the Eridanus constellation, which is best viewed from the southern hemisphere.
The constellations near the plane of the ecliptic (the zodiacal constellations) are only visible at certain times of the year. The constellations towards the poles (N and S) are visible at all times of the year from their respective hemispheres. In the South, the Southern Cross would be one example and in the North the Great Bear (or plough) would be another.
The North Star, also known as Polaris, is visible year-round in the Northern Hemisphere. It is located close to the celestial north pole, making it a good reference point for navigation. Some other constellations that can be seen along with Polaris include Ursa Major, Cassiopeia, and Draco.
It's only visible at night, but it is visible all year round in North America. In fact, it never goes below the horizon anywhere north of the equator.
Some constellations visible in the summer sky between 2am to 5am include Scorpius, Sagittarius, Lyra, Cygnus, and Aquila. These constellations are typically prominent during the summer months in the Northern Hemisphere.
The zodiac constellations visible in the night sky depend on the time of year. Currently, in early December, the zodiac constellations visible in the night sky are Sagittarius, Capricorn, and Aquarius. These constellations are best seen in the evening towards the south.