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Manusmrti, Vishnu purana, Bhavishya purana and Mahabharata, also deal elaborately with the creation of the universe, of the division of the movement of the Universe into specified periods called the Yugas.   
 
Manusmrti, Vishnu purana, Bhavishya purana and Mahabharata, also deal elaborately with the creation of the universe, of the division of the movement of the Universe into specified periods called the Yugas.   
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=== Yuga System ===
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== Yuga System ==
 
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'''.     
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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>  
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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 name=":0">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) 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.
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==== Krita Yuga  ====
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=== Yuga in Vedas ===
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Astronomical knowledge was necessary since early Rig vedic times for the day-today-life of the people seasons for sowing, rains for growth and reaping were all acquired. Direct connection of astronomy, particularly the lunar transits, are seen in the performance of monthly rites such as Darsapurnamasa and seasonal rites such as chaturmasya. Thus vedic people had knowledge required for their religious activities. The Vedic astronomers evolved a system of five years yuga. As seen in Rigveda time period of yuga was mentioned <blockquote>दीर्घतमा मामतेयो जुजुर्वान् दशमे युगे । (Rig Veda 1.158.6)<ref>Rig Veda ([http://vedicheritage.gov.in/samhitas/rigveda/shakala-samhita/rigveda-shakala-samhitas-mandal-01-sukta-158/ Mandala 1 Sukta 158])</ref></blockquote>The names of the five years of a yuga being<ref name=":0" />
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# संवत्सरः॥ Samvatsara
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# परिवत्सरः ॥ Parivatsara
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# इडावत्सरः ॥ Idaavatsara
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# अनुवत्सरः ॥ Anuvatsara
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# इद्वत्सरः ॥ Idvatsara
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=== चतुर्युगाः ॥ Chaturyuga ===
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[[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:
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# कृतयुगम् ॥ Krtayuga
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# त्रेतायुगम् ॥ Tretayuga
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# द्वापरयुगम् ॥ Dvaparayuga
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# कलियुगम् ॥ Kaliyuga
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It may be noted that the time period in four yugas are in the ratio of 4:3:2:1. One Mahayuga is ten times a Kaliyuga in its duration.
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==== Krta Yuga  ====
 
The first Yuga of the Chaturyuga cycle. In this Yuga Dharma represented by the bull supporting the universe stands securely on all four legs. The four legs of Dharma are said to be Satya, Ahimsa, Daya, Dana, truth, non-injury, kindness and generosity, respectively, in rough translation. According to the calculations of the Puranas, the length of the Krtayuga is 17,28,000 years. But with the passage of time, the universe starts getting more and more complex. The innate order starts getting disturbed. Dharma starts getting weakened. And, towards the end of Krta, the creator has to take birth on earth in various forms to re-establish the dharma.
 
The first Yuga of the Chaturyuga cycle. In this Yuga Dharma represented by the bull supporting the universe stands securely on all four legs. The four legs of Dharma are said to be Satya, Ahimsa, Daya, Dana, truth, non-injury, kindness and generosity, respectively, in rough translation. According to the calculations of the Puranas, the length of the Krtayuga is 17,28,000 years. But with the passage of time, the universe starts getting more and more complex. The innate order starts getting disturbed. Dharma starts getting weakened. And, towards the end of Krta, the creator has to take birth on earth in various forms to re-establish the dharma.
  

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