Prahar
Encyclopedia
In Indian languages, prahar is a unit of time. A day is divided into eight Prahars, making each prahar equivalent to three hours. The first prahar starts at 3am.

In Hindustani Music there are raga
Raga
A raga is one of the melodic modes used in Indian classical music.It is a series of five or more musical notes upon which a melody is made...

s which are prescribed to be performed at particular prahar to maximize their aesthetic effects.
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