Dinman and Ratriman is distributed in 8 equal parts, and these 8 parts of time is called Choughariya. When Dinman and Ratriman are equal then one Choughariya is equal to 1:30 Hrs. In jyotish one day of week is calculated from sunrise time to next day's sunrise time. each day is distributed in two parts.
Dinman - Period of day from Sunrise to Sunset
Ratriman - Periode of day from Sunset to Sunrise