We know the symptoms of each of the 4 yugas and pillars of religion(truthfulness, mercy, austerity and cleanliness) reduce with each passing yuga.
Are these symptoms to be seen only on earth or even in other planetary systems?
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Puranas say four Yugas are restricted to Bharata Varsha alone. In chapters which describe Bharata and four Yugas, many Puranas say only Bharatavarsha has division of four Yugas.
Chapter 16, Description of Bharata, Anusanga of Brahmanda Purana says:
68b-69. Sages have said that there are four Yugas, in the Bhårata" sub-continent, viz. Krta, Tretá, Dväpara and Tişya (Kali). I shall mention their detailed divisions wholly later on.
Chapter 29, Cycle of Yugas: Characteristic of four Yugas, Anusanga also says same.
- Wise persons and sages have said that there are four Yugas in Bhārata subcontinent. They are Krta, Treta, Dvāpara and Kali.
Translator says in footnotes
- It is strange that Yugas should be restricted to India (Bhårata) only.
Chapter 18, Umasamhita of Shiva Purana says:
चत्वारि भारते वर्षे युगान्यासन्महामुने।
कृतादीनि न चान्येषु द्वीपेषु प्रभवन्ति हि।।१५।।
- O great sage, all the four Yugas Krta and others are followed in Bhärata and not in the other Dvipas.
Chapter 3, Book 2 of Vishnu Purana says:
चत्वारि भारत वर्षे युगान्यत्र महामुने।।
कृतं त्रेता द्वापश्च कलिश्चान्यत्र न क्वचित्॥ १९॥
In the Bhārata-varsa it is that the succession of four Yugas or ages, the Krta the Treta. The Dvăpara, and Kali, takes place;
Chapter 7, Swarga Khanda of Padma Purana says:
3-8. There are four yugas in Bharatavarsa. The first yuga was Krta; then there was Tretayuga, O brahmanas. After that Dvapara sets in; then comes Kali.
Chapter 114, Part 1 of Matsya Purana says:
चत्वारि भारते वर्षे युगानि मुनयोऽब्रुवन्।
कृतं त्रेता द्वापरं च कलिश्चेति चतुर्युगम्।
तेषां निसर्गं वक्ष्यामि उपरिष्टाच्च कृत्स्नशः॥५७॥
There are four ages in Bharatavarsha viz.- Satya, Tretā, Dvăpara and Kaliyuga. I am now going to give you an account of each.
One can observe repetition of phrase चत्वारि भारते वर्षे युगानि (catvāri bhārate varṣe yugāni) in many Purana. Even description of Bharata and four Yugas is similar in many Puranas.
Only Bhārata Varsha is affected by Yuga cycle. Moreover, this is Karma Bhumi in the sense, here you can perform some deeds. People born in other countries are just experiencing their previous deds. From Mrgendra Agama chapter 13
Those who are living in the Bharata varsha are subjected to changes and deviations occurring in the matters related to knowledge, longevity, complexion, strength, wealth and descendants according to the nature of the cyclic yugas. For the food, they are eating those which are obtained by ploughing and by the works other than ploughing. They are affected by three kinds of miseries – adhyatmika, adhibhautika and adhidaivika. But, there is one specific quality for this Bharta varsha. Whatever be the deeds of the people, the fruits of their deeds are never experienced here; they are experienced in other worlds. Because, all other worlds are considered to be the regions related to the fruits only(phala bhumi). Bharata varsha is the land of deeds only (karma bhumi). Verse 93
Personally, I think whole earth is Bhārata Varsha but don't have any clue about where other countries and continents are!