Rate of Rotation of a Collapsed Star

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  planet in its rotation around the star, passes between us and the star and the star, cutting out line of sight to the star.

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  These pulses are emitted periodically at the same rate as that of the angular rotation of the stars. Neutron stars which emit such pulses are called pulsars.

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  Observe the star from two opposite sides of ecliptic orbit, i.e.at a gap of six months and that will give you the measure of parallax.
  
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