Northern Circumpolar Constellations
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Transcript of Northern Circumpolar Constellations
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Northern Circumpolar Constellations
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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.
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This is what I mean:
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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
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The Big Dipper shows the way to Polaris
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But it is not a real constellation:
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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.
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The Little Dipper w/ Polaris
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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’.
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Draco the Dragon
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The King and Queen
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Does Precession effect the Pole Star? YES!!
• The Earth is like a spinning top.
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This wobble changes the spot that the Earth’s axis points to in the
Northern sky.
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These are the stars visible in the southern polar sky.
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