First of four yugas (ages) in Hindu cosmology
Satya Yuga ( Krita Yuga) (IAST: "Kṛta-yuga"), in Hinduism, is the first and best of the four "yugas" (world ages) in a "Yuga Cycle", preceded by "Kali Yuga" of the previous cycle and followed by "Treta Yuga". "Satya Yuga" lasts for 1,728,000 years (4,800 divine years).
"Satya Yuga" is known as the age of truth, when humanity is governed by gods, and every manifestation or work is close to the purest ideal and humanity will allow intrinsic goodness to rule supreme. It is sometimes referred to as the "Golden Age". "Dharma" (depicted in the form of a bull) symbolizes morality and stood on all four legs during this period; the legs of "Dharma" reduce by one in each "yuga" that follows. As per Bhagavata Purana, the four legs of Dharma are ' lit. 'austerity', ' lit. 'cleanliness' (or ' lit. 'charity'), ' lit. 'compassion' and lit. 'truth'.
Etymology.
"Yuga" (), in this context, means "an age of the world", where its archaic spelling is "yug", with other forms of "yugam", , and "yuge", derived from "yuj" (), believed derived from "*yeug-" (Proto-Indo-European: lit. 'to join or unite').
"Satya Yuga" () means "the age of truth or sincerity", sometimes abbreviated as "Sat Yuga" or "Satyuga".
"Krita Yuga" (), a synonym for "Satya Yuga", means "the accomplished or completed age" or "the age of righteous or action", a time when people perform pious (righteous) actions, and is sometimes referred to as the "Golden Age".
"Krita Yuga" is described in the "Mahabharata", "Manusmriti", "Surya Siddhanta", "Vishnu Smriti", and various Puranas.
Duration and structure.
Hindu texts describe four "yugas" (world ages)⁠ in a "Yuga Cycle", where, starting in order from the first age of "Krita (Satya) Yuga", each "yuga's" length decreases by one-fourth (25%), giving proportions of 4:3:2:1. Each "yuga" is described as having a main period ( "yuga" proper) preceded by its (dawn) and followed by its (dusk)⁠, where each twilight (dawn/dusk) lasts for one-tenth (10%) of its main period. Lengths are given in divine years (years of the gods), each lasting for 360 solar (human) years.
"Krita Yuga", the first age in a cycle, lasts for 1,728,000 years (4,800 divine years), where its main period lasts for 1,440,000 years (4,000 divine years) and its two twilights each lasts for 144,000 years (400 divine years). The current cycle's "Krita Yuga" has the following dates based on "Kali Yuga", the fourth and present age, starting in 3102BCE:
"Mahabharata", Book 12 (Shanti Parva), Ch. 231:
 ;templatestyles src="Template:Blockquote/styles.css" / ;(17) A year (of men) is equal to a day and night of the gods... (19) I shall, in their order, tell you the number of years that are for different purposes calculated differently, in the Krita, the Treta, the Dwapara, and the Kali yugas. (20) Four thousand celestial years is the duration of the first or Krita age. The morning of that cycle consists of four hundred years and its evening is of four hundred years. (21) Regarding the other cycles, the duration of each gradually decreases by a quarter in respect of both the principal period with the minor portion and the conjoining portion itself.
"Manusmriti", Ch. 1:
 ;templatestyles src="Template:Blockquote/styles.css" / ;(67) A year is a day and a night of the gods... (68) But hear now the brief (description of) the duration of a night and a day of Brahman [(Brahma)] and of the several ages (of the world, yuga) according to their order. (69) They declare that the Krita age (consists of) four thousand years (of the gods); the twilight preceding it consists of as many hundreds, and the twilight following it of the same number. (70) In the other three ages with their twilights preceding and following, the thousands and hundreds are diminished by one (in each).
"Surya Siddhanta", Ch. 1:
 ;templatestyles src="Template:Blockquote/styles.css" / ;(13) ... twelve months make a year. This is called a day of the gods. (14) ... Six times sixty [360] of them are a year of the gods... (15) Twelve thousand of these divine years are denominated a Quadruple Age (caturyuga); of ten thousand times four hundred and thirty-two [4,320,000] solar years (16) Is composed that Quadruple Age, with its dawn and twilight. The difference of the Golden and the other Ages, as measured by the difference in the number of the feet of Virtue in each, is as follows : (17) The tenth part of an Age, multiplied successively by four, three, two, and one, gives the length of the Golden and the other Ages, in order : the sixth part of each belongs to its dawn and twilight.
Characteristics.
Among the four eras, the "Satya Yuga" is the first and the most significant one. Knowledge, meditation, and penance hold special importance in this era.
The "Mahabharata", a Hindu epic, describes "Krita Yuga" as such:
 ;templatestyles src="Template:Blockquote/styles.css" / ;Men neither bought nor sold; there were no poor and no rich; there was no need to labour, because all that men required was obtained by the power of will; the chief virtue was the abandonment of all worldly desires. The Krita Yuga was without disease; there was no lessening with the years; there was no hatred, or vanity, or evil thought whatsoever; no sorrow, no fear. All mankind could attain to supreme blessedness.
— Additionally, in Vaishnava dharma, the "Satya Yuga" was characterised by the worship of one god, with the Supreme Godhead Narayana being the only object of worship; thus, demigods were reportedly not worshipped during this period and the world was united under the worship of one mantra--praṇava. Furthermore, there was only one Veda, with the Atharva Veda being divided into four parts later on, shortly before the beginning of the "Kali Yuga."
References.
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