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Beyond Earth

The sky can tell you north

A phone stops working on a dark terrace. There is no compass, a tool that shows north. Which way is north?

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The Pole Star sits fixed at the top. Facing it is north.
Step 1 of 4
  1. The Pole Star sits fixed at the top. Facing it is north.
  2. Turn a quarter-turn clockwise: now you face east.
  3. Turn another quarter: south.
  4. One more quarter: west.

The rule

In India, face the Pole Star and you face north.

One star sits almost above the North Pole, the top of Earth. So that star barely seems to move. This is the Pole Star.

Clockwise means the way a clock's hands turn. A quarter-turn is a quarter of a full circle.

Stars also form patterns called constellations. Saptarishi is a pattern of seven bright stars. Two stars on the Saptarishi bowl point to the Pole Star.

Watch out!

The Pole Star is not the brightest star. Other stars look brighter. The Pole Star is useful because it barely moves.

Jump to lesson

This track

  1. 0 Start here
  2. 1 A star, a planet, or the Moon?
  3. 2 The Moon does not change shape
  4. 3 Waxing and waning
  5. 4 The Sun is a star
  6. 5 Eight planets, eight real distances
  7. 6 The sky can tell you north
  8. 7 What a telescope really adds
  9. 8 The big picture
  10. 9 Track quiz

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