Four Yugas have been described, in the eastern mythology, and as well as in AGGS, which cycle perpetually. As the ages proceed from Satya to Kali, religion and the good quality of men gradually decline. The period of 4 Yugas is 12000 Divine years, and each Divine year is composed of 360 days. One thousand of these Yugas equal one day of Brahma, which is called a Kalpa. Brahma's lifespan is 100 years of his time. The 12000 Divine years are to be multiplied by 360 X 1000 to get the human years in four Yugas= 4,320,000 years. In each Yuga there is a specific process of self-realization (Yuga dharma).
Scientific Age of the Universe:
- The age of the chemical elements.
- The age of the oldest star clusters.
- The age of the oldest white dwarf stars.
From Wikipedia, the free encyclopedia:The three-age system refers to the periodization of human prehistory into three consecutive time periods, named for their respective predominant tool-making technologies:
- The Stone Age
- The Bronze Age
- The Iron Age
Chahu Jug Mailay Mal Bharay Jin Mukh Naam Na Ho-ay, Bhagtee Bhaa-ay Vihooni-aa Muhu Kaalaa Pat Kho-ay.
Nanak Mayr Sareer Kaa Ik Rath Ik Rathvaahu, Jug Jug Fayr Vataa-ee-ah Gi-aanee Bujheh Taahi, Satjug Rath Santokh Kaa Dharam Agai Rathvaahu.
Satjug Sat Santokh Sareeraa, Sat Sat Vartai Gahir Gambheeraa, Sachaa Saahib Sach Parkhai Saachai Hukam Chalaa-ee Hay.
Satjug Sabh Santokh Sareeraa Pag Chaaray Dharam Dhi-aan Jee-o. Man ṯan har gāvahi param sukẖ pāvahi har hirḏai har guṇ gi▫ān jī▫o.
Satjug Sat Taytaa Jagee Du-aapar Poojaachaar, Tinou Jug Tinou Dirhay Kal Kayval Naam Adhaar.
Taraytai Rath Jatai Kaa Jor Agai Rathvaahu.
DVAPARA YUGA - or the Bronze Age, lasts 864,000 years and the process of self realization is the worship of the deities within temples. Godly qualities are reduced to 50% by now and the average life expectancy is only 1000 years.
Du-aapur Rath Tapai Kaa Sat Agai Rathvaahu.
Kal Meh Raam Naam Saar, Akhee Ta Meeteh Naak Pakrheh Thagan Ka-o Sansaar.
Kalijug Har Kee-aa Pag Tarai Khiskee-aa Pag Cha-uthaa Tikai Tikaa-ay Jee-o, Gur Sabd Kamaa-i-aa A-ukhaDh Har Paa-i-aa Har Keerat Har SaaNt Paa-ay Jee-o.
Parathmay Vasi-aa Sat Kaa Khayrhaa, Taritee-ay Meh Kichh Bha-i-aa Dutayrhaa, Dutee-aa ArDho AraDh Samaa-i-aa, Ayk Rahi-aa Taa Ayk Dikhaa-i-aa.
In the first age, the Golden Age, the village of truth was inhabited. In the Silver Age of Treta Yuga, things began to decline. In the Brass Age of Dwaapur Yuga, half of it was gone. Now, only one leg of Truth remains, and the One God is revealed.-----Guru Arjun, Raag Ramkali, AGGS, Page, 886
Chauh Joug Meh Anmrit Saachee Baani, Poorai Bhaag Har Naam Samaanee.
ਹਰਿ ਹਰਿ ਨਾਮੁ ਬੋਹਿਥੁ ਹੈ ਕਲਜੁਗਿ ਖੇਵਟੁ ਗੁਰ ਸਬਦਿ ਤਰਹੁ ॥
Aavhu Sant Milhu Mayray Bhaa-ee Mil Har Har Kathaa Karahu, Har Har Naam Bohith Hai Kaljug Khayvat Gur Sabd Tarahu.
Come, O Saints, and join together, O my Siblings of Destiny; let us tell the Stories of the Eternal God, is the boat in this Dark Age of Kali Yuga; the Word of the Guru's Sabd is the boatman to ferry us across. -----Guru Ram Das, Raag Bilawal, AGGS, Page, 799-18
ਗੁਰਮੁਖਿ ਜਪੀਐ ਲਾਇ ਧਿਆਨਾ
ਆਪਿ ਤਰੈ ਸਗਲੇ ਕੁਲ ਤਾਰੇ ਹਰਿ ਦਰਗਹ ਪਤਿ ਸਿਉ ਜਾਇਦਾ ॥
Kaljug Meh Keertan ParDhaanaa, Gurmukh Japee-ai Laa-ay Dhi-aanaa, Aap Tarai Saglay Kul Taaray Har Dargeh Pat Si-o Jaa-idaa.
In this Dark Age of Kali Yuga, the Kirtan of the God's Praises are most sublime and exalted. Become Gurmukh, chant and focus your meditation. You shall save yourself, and save all your generations as well. You shall go to the Court of the God with honor.-----Guru Arjun, Raag Maru Sohlay, AGGS, Page, 1075-9
ਕਹੁ ਨਾਨਕ ਸੋਈ ਨਰੁ ਗਰੂਆ ਜੋ ਪ੍ਰਭ ਕੇ ਗੁਨ ਗਾਵੈ ॥
Kal Mai Mukat Naam Tay Paavat Gur Yeh Bhayd Bataavai, Kaho Nanak So-ee Nar Garoo-aa Jo Parabh Kay Gun Gaavai.
In this Dark Age of Kali Yuga, liberation comes from the Naam. The Guru has revealed this secret, Says Nanak; he alone is a great man, who sings the Praises of God.-----Guru Tegh Bahadur, Raag Bilawal, AGGS, Page, 831-6
ਨਾਨਕ ਤੇ ਮੁਖ ਉਜਲੇ ਕੇਤੀ ਛੁਟੀ ਨਾਲਿ ॥
Jinee Naam Dhi-aa-i-aa Ga-ay Maskat Ghaal, Nanak Tay Mukh Ujlay Kaytee Nhhutee Naal.
Those who meditated on Naam, and departed after having worked by the sweat of their brows have radiant faces in the Court of the God, and many are saved along with them. O, Nanak.----- Guru Angad, Japji, AGGS, 8-12
"All metaphysical discussion is profitless unless it causes us to seek within the Self for the true reality. All controversies about liberation/moksha, the purpose of God, etc., are useless and are not conducive to our true understanding of the teachings of Sabd Guru. People try to find out about things which are outside of them before they try to find out about Self?”
The earliest description of the origin of Universe, Creation, 3 demi gods, and Vedas is described by Guru Nanak:
ਬ੍ਰਹਮੇ ਮੁਖਿ ਮਾਇਆ ਹੈ ਤ੍ਰੈ ਗੁਣ ॥
saam vayd rig jujar atharban, barahmay mukh maa-i-aa hai tarai gun.
The Saam Veda, the Rig Veda, the Jujar Veda and the Atharva Veda came out from the mouth of Brahma; they speak of the three Gunas, the three qualities of Maya.-----Guru Nanak, Raag Maru, AGGS, Page, 1038-1
Liberation as described by Vedas and Sabd Guru;
saam kahai saytambar su-aamee sach meh aachhai saach rahay.
rig kahai rahi-aa bharpoor.
aj kaaj vee-aahi suhaavai othai maas samaana.
kal meh bayd atharban hoo-aa naa-o khudaa-ee alhu bha-i-aa.
banee barahmaa bayd atharban karnee keerat lahi-aa.
The Aranyakas and Upanishads deny that ritual sacrifice is the only means to liberation, and introduce monistic doctrine. Sabd Guru as referred above states that Gurbani was the mode of liberation in all four Yugas and is most important in the present age as confirmed by Guru Nanak and Guru Amar Das in Raag Dhanasari, Guru Ram Das & Guru Tegh Bahadur in Raag Bilawal, and Guru Arjun in Maru Sohlay.
Finally Sabd Guru has no where pointed out that liberation/self realization can be accomplished by wearing religious symbols or dresses but quite the opposite by only and through Gurbani.
ਰਾਮ ਨਾਮੁ ਪੜਹੁ ਗਤਿ ਪਾਵਹੁ ਸਤਸੰਗਤਿ ਗੁਰਿ ਨਿਸਤਾਰੇ ॥
saastar bayd soDh soDh daykhay mun naarad bachan pukaaray, raam naam parhahu gat paavhu satsangat gur nistaaray.
I searched and searched through the Shaastras and the Vedas; Nard the silent sage proclaimed these words as well. Chanting God's Name, salvation is attained; the Guru saves those in the Sat Sangat, the True Congregation.-----Guru Ram Das, Raag Nut, AGGS, Page, 983-12