Sanskrit Term Definition Modern UnittruTi 1/1687.5th of a secondvedha 100 truTilava 3 vedhanimeSha 3 lava roughly 1/2 secondkshaNa 3 nimeShakAShThA 5 kshaNalaghu 15 kAShThA roughly 2 minutesnADiKA 15 laghumuhUrta 2 nADikA roughly 1 hourprahara or yAma 6 or 7 nADikAdina or rAta 4 praharapaksha 15 days (dina + rAta)mAsa 2 pakshaR^itu 2 mAsaayana 6 mAsa

varsha or vatsara 2 ayanadivya varsha 360 divya divasa

chaturyugi (cycle of12000 divya varshamanvantara 71.43 chaturyugikalpa 1000 chaturyugiparArdha 50 years of brahmA

Notes

depending upon whether day is longer or nightthe whole day (day +night) would be 8 praharasthere are 2 paksha- shukla and krishNaThis is equivalent to 1 day of pitaraThis is also known as season. There are 6 seasons in a year.There are 2 ayanas- daxinayana and uttarayana

period of manu1 day of brahmA. Night is equally long

This is equivalent to one day-night for devas (1 divya divasa)This is also categorized as 'saMvatsara', 'parivatsara', 'iDAvatsara', 'anuvatsara', 'vatsara'

sat yuga- 4000 divya varsha and 800 divya varsha for sandhyAMshatreta yuga- 4000 divya varsha and 800 divya varsha for sandhyAMshadwApara yuga- 4000 divya varsha and 800 divya varsha for sandhyAMshakali yuga- 4000 divya varsha and 800 divya varsha for sandhyAMsha