Kāla-Māna in the Vāyu Purāṇa
Kāla-māna means “the measuring of time”. Chapter 57 of the Vāyu Mahā Purāṇa sets out the full Vedic system for counting time. It starts from the smallest unit a person can notice, the nimesha (the blink of an eye), and climbs all the way to great cycles of the sky, including the Saptarshi-saṃvatsara, the Krauñca-saṃvatsara and the Divya-saṃvatsara.
The chapter also explains that time runs on different scales for different beings: human time (mānusha), the time of the devas (daiva) and the time of the pitṛs, the honoured ancestors (paitṛka). It gives the exact ratios between these scales. This teaching prepares the way for the account of the four yugas (the Catur-yuga-ākhyāna) that follows in Chapter 58.
The Basic Units
The Vāyu Purāṇa lists the basic units of Vedic time, from the smallest upward:
| Unit | Made of | Notes |
|---|---|---|
| Nimesha (eye-blink) | The smallest unit | As long as it takes to say one laghu-akshara (short syllable) |
| Kāshṭhā | 15 nimeshas | — |
| Kalā | 30 kāshṭhās | — |
| Muhūrta | 30 kalās | — |
| Ahorātra (day and night) | 30 muhūrtas | One full day |
The ahorātra is split into the day (prabodha, “waking”, the time for work) and the night (śayana, “lying down”, the time for rest). The Sun makes this division of day and night, both for humans and for the realms of the devas.
Human Time, Pitṛ Time and Deva Time
One of the most important teachings in this chapter is how human time relates to the time of the pitṛs (ancestors) and the devas.
Time of the Pitṛs
- One human month (māsa) = one pitṛ day (pitṛ-ahorātra)
- The kṛshṇa paksha (dark fortnight, when the moon wanes) = the daytime of the pitṛs
- The śukla paksha (bright fortnight, when the moon grows) = the night of the pitṛs
- Thirty human months = one pitṛ-māsa (month of the pitṛs)
- Three hundred and sixty human months = one pitṛ-saṃvatsara (year of the pitṛs)
- One hundred human years = three pitṛ months and ten days
This is the basis of pitṛ-tarpaṇa, the offering of water and food to the ancestors. Amāvāsyā (the new-moon day) is the point where the day of the pitṛs turns into their night, and it is the moment when the pitṛs can most easily be reached.
Time of the Devas
- One human year (mānusha saṃvatsara) = one deva day (daiva ahorātra)
- Uttarāyaṇa (the Sun’s northward course) = the daytime of the devas
- Dakshiṇāyana (the Sun’s southward course) = the night of the devas
- Thirty human months = three deva months and ten days
- One deva-māsa (month of the devas) = about one human year
- One deva-saṃvatsara (year of the devas) = 360 human years (365 human years in some ways of counting)
The text says: “The Sun divides time into human and divine portions; this is the sure teaching of the śāstras.”
Special Cycles of Time
Beyond these basic scales, the Vāyu Purāṇa names several larger cycles:
| Unit | Length in human years | Notes |
|---|---|---|
| Saptarshi-saṃvatsara | 3,030 | The cycle of the Saptarshis, the Seven Ṛshis |
| Krauñca-saṃvatsara | 9,000 | Named after the krauñca bird; a great cycle in between |
| Divya-saṃvatsara | 36,000 | One full divine year (100 deva years of 360 deva days each) |
The Saptarshi-saṃvatsara is the time the Seven Ṛshis (the stars of the Great Bear) take to go once around the sky, measured against the nakshatras (the lunar mansions). The Purāṇas use this cycle as a reference point when counting long spans of history.
The Divya-saṃvatsara of 36,000 human years is the base unit for measuring the length of the yugas in divine years. So the Kali Yuga of 432,000 human years equals 12 divya-saṃvatsaras in some ways of counting, and the full Catur-yuga (the set of four yugas) of 4,320,000 human years equals 120 divya-saṃvatsaras.
The Human Year as the Standard
The Vāyu Purāṇa makes the mānusha-saṃvatsara (the ordinary human year) the standard by which all other time is measured:
“The year known by its worldly measure is the mānusha (human) saṃvatsara. It is by this human year that I here narrate the Catur-yuga.”
The year has two main halves:
- Uttarāyaṇa (from Makara-saṃkrānti to Karkaṭa-saṃkrānti): the six months when the Sun moves north. This half is thought auspicious and is the daytime of the devas.
- Dakshiṇāyana (from Karkaṭa-saṃkrānti to Makara-saṃkrānti): the six months when the Sun moves south. This half is the night of the devas.
This division of the year into two ayanas (courses of the Sun) lies at the root of the Vedic understanding of time.
Time and Yajña
The chapter places its teaching on time within yajña-pravartana, the setting up of yajña (sacred fire offering). Brahmā instructs Manu: “Time is the frame of everything. When the yugas pass and people become weak, the Vedas must be renewed so that yajña does not perish. Without yajña the devas cannot be sustained; without the devas sustained, the three worlds perish.” So exact knowledge of time is not only about the stars. It is directly tied to keeping up the order of yajña that holds the universe together.
Sources
- Vāyu Mahā Purāṇa, Chapter 57