Yuga: Satya Yuga, Treta Yuga, Dwapar Yuga, Kali Yuga

Yuga (Devanāgari: युग) in Hindu philosophy is the name of an epoch or era within a four age cycle. According to Hindu cosmology, life in the universe is created and destroyed once every 4.1 to 8.2 billion years. The lifetime of a Brahma himself may be 311 trillion and 40 billion years.
Like Summer, Spring, Winter and Autumn, each yuga involves stages or gradual changes which the earth and the consciousness of mankind goes through as a whole. A complete yuga cycle from a high Golden Age of enlightenment to a Dark Age and back again is said to be caused by the solar system's motion around another star.

The ages see a gradual decline of dharma, wisdom, knowledge, intellectual capability, life span, emotional and physical strength.

In The Holy Science, Sri Yukteswar wrote that the traditional or long count view is based on a misunderstanding. He says that at the end of the last descending Dvapara Yuga (about 700 BC), "Maharaja Yudhisthira, noticing the appearance of the dark Kali Yuga.

1. Satya Yuga:- Virtue reigns supreme. Human stature was 21 cubits. Average human lifespan was 100,000 years.
2. Treta Yuga: – There was 3 quarter virtue & 1 quarter sin. Normal human stature was 14 cubits. Average human lifespan was 10,000 years.
3. Dwapar Yuga: – There was 1 half virtue & 1 half sin. Normal human stature was 7 cubits. Average human lifespan was 1000 years.
4. Kali Yuga: – There is 1 quarter virtue & 3 quarter sin. Normal human stature is 3.5 cubits. Average human lifespan will be 100 years. Towards the end of the Yuga this will come down to 20 years.

1. Satya yuga - This is first yuga in total four yuga. The word Satya is Hindu Sanskrit words whose meaning is Truth or Reality. It is also known as Golden age.

2- Treta Yuga - This is the Second yuga in Total four yuga. It appeared after Satya Yuga.This is also known as Golden age because Lord Vishnu 3 avatar(incarnation) appeared in Treta Yuga.The 3 avatar name are Vamana(5th incarnation of lord vishnu),Parshurama(sixth incarnation of lord vishnu) and Shree Ram (7th incarnation of lord Vishnu).

About Vamana - Lord vishnu in form of Vamana(small dwarf) appeared in Treta yuga to Kill Demon King Bali.
About Parshuram - Lord vishnu in form of Parshuram(Brahmin with Axe in hand) appeared in Treta yuga to kill the warrior(kshetriya) who were Evil.
About Shree Ram - Lord Vishnu(God Shree Ram) appeared in Treta yuga to kill Demon King Rawan.

3 - Dwapar Yuga - This is Third Yuga among Four Yuga in Hindu Religion. Dwapara Yuga appeared after the Treta yuga.Dwapara yuga was not good more than Treta yuga or Satya yuga because in Total of 100 % only 50 % peoples used to follow religion and truth path way.

Dwapara yuga is also the most powerful,golden stage Yuga because Lord Shree Krishna and His Brother Shree Lord Balaram himself appeared in Dwapara Yuga. The only one Supreme Book of Hindu Religion 'Bhagavad Geeta' is stated by lord krishna for the mankind of people. He came to save life of people of Gokula, Mathura and Vrindavana.He appeared to help his friend/devotee "Arjuna and His brother" to win The Battle field of Kurukshetra. 'Arjuna and his Brother' were supreme god himself who was follower of truth and Religion.

4 - Kaliyuga - Kaliyuga is last and Final yuga or Stage among Four Yuga in Hindu Religion.We are now in Kaliyuga presently.In this yuga in total of 100 % only 25 % of peoples follow Religion,Truth.

This is also known as Golden age because Lord Vishnu appeared in Form of Lord Buddha to Help people who are suffering from Lack of Love,Honesty,Religion,Peace.Lord Buddha Established Religion,Peace and Honesty.

In Hindu Religious Script it is mention that Kaliyuga peoples forget all their religions,path of truth.Slowly there will be Lack of Mind for Religion,Truth.There will fight against peoples. One Peoples discriminates another people with different Reason.Son will order Father.

It is also mention in Religious Script that at the End of Kaliyuga when there will be No path of Truth,Religion and Honesty -
"Lord Shiva and Lord Vishnu(kalki) will appeared to establish Religion,Truth.
Lord vishnu and Lord Shiva will appear to destroy kaliyuga.