Astronomy During the Vedic Period-2 Time Units KALPA and YUGA are common terms and, are understood as some unit of time denoting a specific period. However, KALPA is not used as a unit of time in Vedas, though it is used extensively during the post-Vedic period. YUGA as a unit of time, finds a mention in the Vedas in several places. These references in the Vedas suggest that the word yuga does denote a certain period of time. This period is not quantified but is a smaller period of 5 to 10 years. For example as given in the following verses युगे ुगे विदध्यं मृणद्भ्योगनेरथि यशसं धेहि नव्यसीं ॥ | ऋ. स. ६. द. ५. " Oh! God of fire, give riches and success to us who offer new words of praise to thee for the ...