By Jean Meeus
Acknowledged in book," almost each prior guide on celestial calcuations used to be compelled to depend on formaulae for solar Moon and planets that have been built within the final century or sooner than 1920. together with his designated knack for computations of every type, the writer has made the fundamental of those smooth options to be had to us all.
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There are many everyday examples of the Doppler effect that we experience – for example, the changing pitch of police and ambulance sirens, or train whistles and racing car engines as they pass by. This very basic principle is used in a variety of tools such as radar guns used by police to check for speeding vehicles and meteorologists use it to record the weather events. By measuring the change in frequency of the waves that reflect from an object, one can deduce the velocity of the object. Analogous to sound, the frequency of light from distant stars and galaxies can be shifted in very similar fashion.