D1 Chart: Rashi, Lagna and Whole-Sign Houses
Read a D1 chart by separating a planet’s sign, the ascendant and house number. Includes a longitude example and checks for missing birth time.
Overview
The D1 or Rashi chart preserves the twelve natal zodiac signs without a finer varga subdivision. In this guide it uses sidereal positions and whole-sign houses from lagna. A planet’s zodiac sign and its house are related but different fields.
At a glance
- Division
- One 30° segment per sign
- Zodiac here
- Sidereal; record the ayanamsa
- House reference
- Whole-sign from lagna
- Unknown birth time
- Do not assume a verified ascendant
How do I read a D1 chart?
Identify the sign containing lagna, then count that entire sign as house one in the stated whole-sign method. Find each planet’s sign and count forward from lagna. The sign’s ruler is a separate planet assignment, not necessarily an occupant of that house.
A D1 chart is the reference layer when reading D9 or D10; the divisional labels must remain attached to their placements. Never move a D9 planet into a D1 house simply because both charts use the same twelve sign names.
A longitude is not yet a house number
An invented sidereal longitude of 219°42′ equals Scorpio 9°42′: subtract Scorpio’s 210° starting longitude. With Taurus lagna, Scorpio is the seventh whole-sign house. Scorpio’s ruler is Mars, wherever Mars is actually placed.
Change only the reference to Leo lagna and Scorpio becomes the fourth house; the planet remains Scorpio 9°42′. This is why a screenshot that omits lagna, chart layer or house method is insufficient for checking the house number.
What if the birth time is uncertain?
Record the credible time interval and recalculate rather than choosing a convenient rising sign. If the interval spans a lagna boundary, explain both possible whole-sign layouts and leave the ascendant-dependent conclusion unresolved. A date-only record does not establish exact houses.
Compare zodiac and ayanamsa before comparing D1 signs across apps. A tropical-to-sidereal difference is not merely a different drawing style. D1 organizes traditional chart questions; it does not by itself measure health, personality or future results.
Sources and editorial basis
- P. V. R. Narasimha Rao: Vedic Astrology — An Integrated ApproachRao, Vedic Astrology: An Integrated Approach. §6.2.1, p. 52: D1; §1.3.2 / Table 1, p. 6: Scorpio starts at 210°; §§1.3.3 and 7.1, pp. 7–8 and 67–68: inclusive sign-based house counting; §3.3 / Table 6, pp. 34–35: sign rulers. These passages document named traditional methods, not scientific validity. Examples are synthetic, not verified birth observations.A named practitioner’s introduction to Jyotish. Used for terminology and a stated method, not universal school agreement or scientific validation. The added March 18, 2010 note describes changed views; it does not establish a fully revised 2010 edition.
- OpenFate Editorial MethodologyOpenFate Editorial Methodology, stable sections #editorial-principles, #editorial-workflow, #editorial-ai, and #editorial-context. Used for the calculation/interpretation and evidence-boundary policy.OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.
- OpenFate Vedic implementation: local source review, 2026-09-08Read-only source review on 2026-09-08: openfate/app/modules/vedic/logic/policy.ts, VEDIC_ENGINE_POLICY (vedic-policy-1.1.0): Vimshottari only and 365.25-day years; math.ts, horaSign and computeVargaSigns: named D2 Sun/Leo and Moon/Cancer mapping plus D6/D9/D10/D24. This verifies the local declared implementation, not current production or alternate-method UI support.An editorial review of local policy and calculation source files, not an independently accessible publication or proof of the deployed version. Implementation limitations and discrepancies remain separate from traditional arithmetic.