Calculating Earth’s Rotation Speed Using Shadow Dynamics and Virtual Simulation

inPhysics

Background

The earth has an intrinsic rotation about its axis. The time taken for this rotation is 24 hours independent of the geographical location. However, the speed of rotation varies from place to place. The speed of rotation at a given latitude is directly related to the speed of the shadow that a vertical pole casts on the ground. A diagrammatic representation can show that both the radial speed as well as angular speed of the shadow need to be analysed to obtain the linear speed of earth at a given geographical location.

Learning Outcome (LO)

  • LO #1: Understanding the effect of geographical location on the radial and angular speeds of the shadow. 
  • LO #2: Determine the parameters and develop a mathematical model to obtain the relation between the angle with which the shadow rotates and the rotation speed of the earth.

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