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On the macroscopic scale of time, the yuga system is highly evolved in the Indian Astronomy. Many important elements of planets and other parameters are given in terms of the number of revolutions in the course of a long period of time called '''yuga'''.     

On the macroscopic scale of time, the yuga system is highly evolved in the Indian Astronomy. Many important elements of planets and other parameters are given in terms of the number of revolutions in the course of a long period of time called '''yuga'''.     

While in the [[Vedanga Jyotisha (वेदाङ्गज्योतिष्)|Vedanga Jyotisha]] the word yuga was used to mean a period of 5 years, in later works the word meant a large period of time. Yugas of large periods of time have been used to indicate the rates of motion of planets and other important points of astronomical significance. This technique enabled them to express these constants as integers, though very large, thus avoiding very inconvenient fractions.     

While in the [[Vedanga Jyotisha (वेदाङ्गज्योतिष्)|Vedanga Jyotisha]] the word yuga was used to mean a period of 5 years, in later works the word meant a large period of time. Yugas of large periods of time have been used to indicate the rates of motion of planets and other important points of astronomical significance. This technique enabled them to express these constants as integers, though very large, thus avoiding very inconvenient fractions.<ref>Balachandra Rao, S. (2017 Third Edition) Indian Mathematics and Astronomy. Benguluru : Bhavan's Gandhi Center of Science & Human Values</ref>    

[[File:Kalachakra.png|thumb|653x653px|Yugas and Kalpa ]]Yuga (युगम्) One of the four large periods into which the basic Chaturyuga cycle is divided, it forms the basic Indian cycle of creation and destruction. According to the puranas and the astronomical texts one Chaturyuga consists of 43,20,000 solar years. Thousand Chaturyugas form a Kalpa, which is the larger cycle of creation and destruction, and is seen as the day of Brahma. The four Yugas comprising the Chaturyuga are: Krita, Treta, Dvapara and Kali. It may be noted that the four yugas are in the ratio of 4:3:2:1. One Mahayuga is ten times a Kaliyuga in its duration.

[[File:Kalachakra.png|thumb|653x653px|Yugas and Kalpa ]]Yuga (युगम्) is one of the four large periods into which the basic Chaturyuga cycle is divided, it forms the basic Indian cycle of creation and destruction. According to the puranas and the astronomical texts one Chaturyuga consists of 43,20,000 solar years. Thousand Chaturyugas form a Kalpa, which is the larger cycle of creation and destruction, and is seen as the day of Brahma. The four Yugas comprising the Chaturyuga are: Krita, Treta, Dvapara and Kali. It may be noted that the four yugas are in the ratio of 4:3:2:1. One Mahayuga is ten times a Kaliyuga in its duration.

==== Krita Yuga  ====

==== Krita Yuga  ====