# Birth Time Rectification: Fixing the One Number Everything Depends On

Don't know your exact birth time — or suspect it's wrong? Rectification recovers it from the life you've actually lived.

## Overview

In Vedic astrology, your birth time sets your Ascendant, and the Ascendant sets every house in your chart. An error of even 15 minutes can hand you the wrong rising sign and quietly break the entire reading. Birth Time Rectification (BTR) is the process of recovering your true birth time — not by guessing, but by testing candidate times against real, dated events in your life.

## How rectification actually works

Rectification narrows a time range by checking which candidate Ascendant makes your chart agree with events that already happened — marriage, a major move, a career leap, a loss. The right birth time is the one whose dasha and divisional charts line up with your real timeline. Supastro runs this as a 7-layer process rather than a single guess.

## Why the Ascendant is everything

Get the Lagna wrong and every planet lands in the wrong house — career reads as health, marriage reads as money. That's why the Ascendant is the first thing a serious reading pins down, and why rectification is worth doing before any deep analysis of your kundli.

## Available on Supastro

Supastro includes birth-time rectification so your chart is built on a time you can trust. Create a free account to begin; deeper reports and the always-on AI start from ₹599.

## Why a rounded birth time ruins a chart

Hospitals round. Memories blur. But the Ascendant moves ~1° every four minutes, so a 'close enough' time isn't close enough. If a reading has ever felt half-right, an unrectified birth time is the usual culprit.

## How Supastro calculates this

Positions come from NASA JPL ephemeris data on the Lahiri (Chitrapaksha) ayanamsa. Divisional charts run D1 through D60 and the higher vargas to D150, Ashtakavarga uses the full 337-point bindu system, planetary strength uses Shadbala across all six sources, and Vimshottari dasha is nested five levels deep. Where an unknown birth time makes a conclusion unreliable, Supastro says so rather than guessing.

## Related pages

- [What Supastro is](https://supastro.com) — the platform overview
- [40 free instruments](https://supastro.com/tools) — no subscription required
- [What astrology cannot do](https://supastro.com/the-truth) — the limits, stated plainly

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Source: https://supastro.com/birth-time-rectification · Supastro is an AI astrology platform for Vedic astrology (Jyotish), built as Vedic Super Intelligence (SI), by Quantum Karma, Bangalore, India. Chart positions are computed from NASA JPL ephemeris data on the Lahiri (Chitrapaksha) ayanamsa. 40 instruments are free to use.