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Dasha Calculator

This calculator applies a transparent method and shows its rules, results, and limitations.

Generate a limited Vimshottari Dasha calculator from a Lahiri Moon position while keeping rule and cultural review explicit.

Enter the calculation details

Enter the birth instant and a UTC analysis instant to calculate the active Dasha periods.

Birth or civil-time details

Use the calendar date at the location of the event.

Enter the clock time shown at that location, not a converted UTC time.

Use UTC or a location ID such as America/New_York, Europe/Madrid, or Asia/Kolkata; abbreviations such as EST are not accepted.

Keep the safe default unless this clock time occurred twice during a daylight-saving change. Then choose the occurrence recorded at birth.

Analysis instant

This instant is interpreted as UTC, within 1900–2100, and sent with a Z suffix.

Fixed calculation settings

Algorithm
vimshottari-dasha-lahiri-v1
Interpretation
dasha-copy-1.0.0
Profile
vedic-lahiri-v1
Zodiac
sidereal
Ayanamsa
lahiri
Rule set
vimshottari-dasha-year-v1

Processed securely for this calculation and not savedOnly the fields required for the calculation are sent. They are not saved or added to the page URL.

Your entries are sent only to this same-origin calculation endpoint. The response is private, uses no-store caching, and is not added to the page URL.

What the calculator calculates

The calculator derives the sidereal Lahiri longitude of the natal Moon, identifies its Nakshatra and lord, and calculates the remaining portion of the starting Mahadasha. It displays the Nakshatra, lord, opening balance, start-inclusive/end-exclusive periods, the period active at an explicitly entered UTC analysis instant, and one Antardasha level.

The current result exposes yearLengthDays: 365.25, the interval policy, Mahadasha and Antardasha boundaries, the normalized birth instant, and the analysis instant. The form does not default to “today”: the user must enter the analysis date and time in UTC.

Proposed sequence and arithmetic

The planning rulepack records the 120-year Vimshottari sequence as Ketu 7, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, and Mercury 17. The starting balance is proportional to the untraversed part of the natal Nakshatra.

Why birth-time precision matters

The Moon moves continuously. Near a Nakshatra boundary, uncertain time can change the starting lord and every downstream date. Exact timeline output therefore needs a civil date, time, and IANA timezone that can be normalized without a daylight-saving ambiguity.

Method and limitations

Editorial and cultural review must also define neutral language. A Dasha is not permission to predict death, illness, marriage, wealth, accidents, or another person's behavior. The calculator shows period arithmetic without adding a symbolic event forecast.

Limitations

Different Jyotish schools and software can use different ayanamsas, year lengths, boundary rules, period depths, and interpretive practices. Results from those methods are not interchangeable. A version label does not make one tradition universally correct.

Even an exact computational timeline is not a scientific forecast. It must not drive medical, legal, financial, safety, relationship, or religious decisions. No fear-based remedy, paid ritual, mantra prescription, or certainty claim belongs in the result.

Privacy in the calculator

The minimum civil-time fields travel only by same-origin POST, are processed transiently, and return with private, no-store behavior. Birth details, timezone, period facts, result IDs, or stable hashes must not appear in URLs, storage, logs, traces, replay, analytics, metadata, advertising, or quiz parameters.

Explanatory example

Suppose a fixture places a synthetic Moon partway through a Nakshatra. The pinned engine provides the longitude; the ruleset computes the remaining fraction and derives period boundaries from the same year constant. The page displays the settings and warnings. This describes a testable output shape and is not a timeline for a real person.

Frequently asked questions

Can I calculate my Dasha here today?

Which year length does this calculator use?

What if I do not know my birth time?

The calculator requires a local time and does not silently create a timeline from noon or calculate an uncertainty range.

Does a Dasha predict a guaranteed event?

No. Its interpretation is a symbolic tradition, not a scientific event forecast.

Will birth data be stored?

Conclusion

Sources

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