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Northern hemisphere HTML5

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Summary

The constellations are imaginary figures made of groups of stars forming patterns which allow an observer to easily identify star positions. Most were named in ancient times, after animals or mythological figures. In the 1920’s, the International Astronomical Union fixed the boundaries of the 88 officially recognized constellations. Stars locations are indicated  by a Greek letter and their equatorial coordinates.

This map of the Northern Hemisphere sky shows the constellations seen by an observer at the North Pole.  The sky seems to turn around an axis (passing nearby the North Star), but it is actually the Earth that is turning relative to the stars.

Click on to rotate.

Rollover the stars to see the names and forms of the constellations.

Learning goals

  • To name the constellations of the northern hemisphere.
  • To illustrate the effect of the terrestrial rotation on our view of the sky

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The constellations are imaginary figures made of groups of stars forming patterns. Most of them were named in ancient times after animals or mythical creatures. In the 1920s the borders of the 88…

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