Class 11 Physics Units and Measurements Measuring large Distances

Measuring large Distances – Parallax Method

  • Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. Distance between the two viewpoints is called Basis.

Measuring distance of a planet using parallax method

Similarly, α = d/D

Whereα = angular size of the planet (angle subtended by d at earth) and d is the diameter of the planet.αis angle between the direction of the telescope when two diametrically opposite points of the planet are viewed.

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