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The Science of Sacred Time — from Paramanu to Kalpa
The Hindu system of time measurement spans from the tiniest perceptible unit to cosmic eons, with precise mathematical ratios between each level.
| Unit | Sanskrit | Composition | Modern Equivalent |
|---|---|---|---|
| Paramanu | परमाणु | 1 base unit | ~16.8 microseconds |
| Truti | त्रुटि | 2 Paramanu | ~33.7 microseconds |
| Tatpara | तत्पर | 100 Truti | ~3.37 milliseconds |
| Nimesha | निमेष | 5 Tatpara | ~0.2 seconds (1 blink) |
| Kashtha | काष्ठा | 15 Nimesha | ~3.2 seconds |
| Laghu | लघु | 15 Kashtha | ~48 seconds |
| Ghati / Nadika | घटी / नाडिका | 15 Laghu | ~24 minutes |
| MuhurtaKey | मुहूर्त | 2 Ghati | ~48 minutes |
| Prahara | प्रहर | 7.5 Muhurta | ~6 hours |
| Dina (Day)Key | दिन | 4 Prahara | 24 hours |
| PakshaKey | पक्ष | 15 Dina | 15 days (fortnight) |
| Masa (Month)Key | मास | 2 Paksha | ~29.5 days |
| Ritu (Season) | ऋतु | 2 Masa | ~2 months |
| Ayana | अयन | 3 Ritu | 6 months |
| Samvatsara (Year)Key | संवत्सर | 2 Ayana | ~365.25 days |
| Mahayuga | महायुग | 4 Yugas | 4,320,000 years |
| Kalpa | कल्प | 1,000 Mahayuga | 4.32 billion years (one day of Brahma) |
A Mahayuga consists of four Yugas in descending quality. Together they span 4,320,000 years, after which the cycle repeats.
The Golden Age. Full dharma, no disease, direct perception of truth. Lifespans of thousands of years. Pure consciousness.
Three-quarters dharma. Rituals and sacrifice emerge as paths to truth. Age of Lord Rama. Lifespans of hundreds of years.
Half dharma. Knowledge declines, Vedas are divided. Age of Lord Krishna. War and conflict become common. ~100 year lifespans.
One-quarter dharma. The age of strife and discord. Spiritual knowledge must be actively sought. Began Feb 18, 3102 BCE at the end of the Mahabharata War.
Hindu cosmology describes time as a nested hierarchy of cycles within cycles — from a single Mahayuga all the way to the lifespan of Brahma, the Creator. Each level of the hierarchy has precise mathematical relationships defined in the Surya Siddhanta and Vishnu Purana.
One complete cycle of the four Yugas. The ratio between them is 4:3:2:1, reflecting the progressive decline of Dharma. Each Yuga also has a transitional dawn (Sandhya) and dusk (Sandhyamsha) period, which are included in the counts above.
The reign of one Manu — the progenitor of humanity for that age. Each Manu establishes Dharma, law, and social order. There are 14 Manus in a Kalpa. We are in the 7th Manvantara under Vaivasvata Manu (also called Shraddhadeva), the 28th Mahayuga of this Manvantara.
One day of Brahma — the waking period when the universe exists. During a Kalpa, 14 Manus reign in succession, with a Sandhya (twilight dissolution) between each. At the end of the Kalpa, a partial dissolution (Naimittika Pralaya) occurs. The current Kalpa is called Shveta-Varaha Kalpa ("White Boar"), named after Vishnu's Varaha avatar.
When Brahma sleeps, the three worlds (Bhuloka, Bhuvarloka, Svargaloka) are submerged in the cosmic ocean. All living beings enter a state of suspended existence (Avyakta) within Brahma. The higher worlds (Maharloka and above) survive. When Brahma wakes, creation resumes from where it paused — this is Naimittika Pralaya (incidental dissolution), not total annihilation.
One complete day-night cycle of Brahma. The universe manifests during the day and dissolves during the night. This is remarkably close to modern estimates of the age of our observable universe (~13.8 billion years for half its projected lifespan).
Brahma's year consists of 360 of his day-night cycles (using the divine calendar where there are no extra days). Each of these 360 days sees one complete creation and dissolution of the three worlds.
Brahma lives for 100 of his years. At the end of Brahma's life, Mahapralaya (the great dissolution) occurs — everything, including Brahma himself and all the Lokas, dissolves into the primordial Prakriti. Then, after an equal period of cosmic void, a new Brahma is born from Vishnu's navel, and the entire cycle begins again. According to the Puranas, the current Brahma is in his 51st year — meaning approximately half of total existence has elapsed.
Daily dissolution — the sleep and death of individual beings. Occurs continuously.
Brahma's nightly sleep — the three lower worlds dissolve, higher lokas survive. Occurs every Kalpa (4.32B years).
Brahma's death — everything dissolves into Prakriti (primordial nature). Even Brahma ceases. Occurs after 100 Brahma years (311 trillion years).
Individual liberation (Moksha) — the soul's personal dissolution from the cycle of rebirth. Not cosmic, but the ultimate goal of Jyotish and Vedanta.
"After Mahapralaya, for a period equal to Brahma's entire lifespan, nothing exists but Maha-Vishnu resting on the cosmic serpent Shesha upon the causal ocean. Then, from His navel springs a lotus, from which a new Brahma is born, and 311 trillion years of creation begin again." — Bhagavata Purana
The tropical zodiac drifts relative to the fixed stars due to Earth's axial precession. Ayanamsha is the correction applied to convert tropical longitudes to sidereal.
Earth's rotational axis slowly wobbles like a spinning top, completing one full circle in ~25,772 years. This causes the vernal equinox to slowly "drift" through the constellations at ~50.3 arcseconds per year.
Official Govt of India. Most widely used in India.
Used by B.V. Raman school.
Used in KP System (Placidus houses).
Western sidereal astrology.
This means sidereal positions are 24.12° behind tropical positions. The gap increases by ~50.3″ every year.
Panchanga (पञ्च + अङ्ग = five + limbs) describes the day through five astronomical measurements, giving a complete picture of the day's cosmic energy.
The lunar day — defined by the angular separation between Sun and Moon (every 12° = 1 Tithi). There are 30 Tithis in a lunar month.
The weekday — each day is ruled by a planet whose Hora (planetary hour) begins at sunrise. The seven days map to the seven visible celestial bodies.
The lunar mansion — the zodiac is divided into 27 equal sections of 13°20' each. The Nakshatra is determined by the Moon's sidereal longitude at sunrise.
The Sun-Moon combined longitude — the sum of Sun's and Moon's sidereal longitudes divided by 13.33° gives the Yoga number (1-27).
The half-Tithi — each Tithi is divided into two Karanas of 6° each (Moon-Sun elongation). There are 11 Karanas: 4 fixed (Sthira) and 7 movable (Chara).
Muhurta is the art of selecting auspicious moments for undertaking activities. A day has 30 Muhurtas (~48 min each), each ruled by a deity with specific qualities.
A solar day (sunrise to next sunrise) is divided into 30 equal Muhurtas — 15 day muhurtas (sunrise to sunset) and 15 night muhurtas (sunset to next sunrise). Each spans ~48 minutes.
Best for spiritual practice, study, meditation
Most auspicious of the day — all activities
Victory in competitions, military, legal
Lunar nectar period — excellent for all
Live astronomical data for today — fetched from our calculation engine.