Northern Circumpolar Constellations

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Presentation transcript:

Northern Circumpolar Constellations

What does circumpolar mean? to circle around the pole- or North Star. daily trace circles around the north celestial pole, without setting or dipping below the horizon. move in a counterclockwise direction. On any given night, the constellation is visible during a portion of the circle; the rest is traced out when the constellation is hidden in the daylight sky.

This is what I mean:

Circumpolar Constellations: Ursa Major, the Big Bear (includes the Big Dipper) Ursa Minor, the Little Bear Cassiopeia, the Queen of Ethiopia Cepheus, the King of Ethiopia Draco the Dragon

The Big Dipper shows the way to Polaris

But it is not a real constellation:

What is it? An ASTERISM The Big Dipper and Little Dipper are part of two other official constellations The Great Bear and Little Bear respectively. They are a familiar, but unofficial grouping of stars.

The Little Dipper w/ Polaris

Why is Polaris so important? it stays relatively fixed in the heavens while all of the other stars move in circular arcs throughout the night. In the past, it has been called ‘the ship star’, ‘the leading star’, ‘star of the sea’ and the ‘steering star’ Native Americans called it the ‘nail of the sky’.

Draco the Dragon

The King and Queen

Does Precession effect the Pole Star? YES!! The Earth is like a spinning top.

This wobble changes the spot that the Earth’s axis points to in the Northern sky.

These are the stars visible in the southern polar sky.

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