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Question

(a) Explain how you can locate the Pole star with the help of Ursa Major constellation.

(b) Explain how the position of sirius star can be located in the night sky with help of Orion constellation.


Solution

(a) Follow these steps for locating the pole star:

  • Locate the Ursa Major and locate the quadrilateral in it.
  • Select the two stars on the far side of the quadrilateral.
  • Join these stars with a line and extend this imaginary line towards the top of the ladle.
  • A faint star which meets this line is the pole star.

(b) SIRIUS (Dog star) →  It is associated with the legend of Orion. It is also called ‘Dog Star’ because it represents Orion’s large hunting dog. 

The simplest way to find Sirius is to find Orion and use the belt as a signpost. In the Northern Hemisphere, winter nights after 9 p.m. are among the best times to look for Sirius using Orion's Belt as a guide. In late winter/early spring, look due south for the bright star itself. Look toward the south-southeast to find Sirius in winter in the Northern Hemisphere. Locate the constellation of Orion, particularly the three stars of Orion’s belt. Focus in on the leftmost star of the belt.


Physics
Science for Eighth Class
Standard VIII

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