D2 Hora Chart: The 15° Rule and Its Limits
Learn Sun and Moon Hora allocation in odd and even signs, check a 15° boundary, and distinguish a named D2 layout from a universal rule.
Overview
D2 Hora divides each natal sign into two 15° halves. The Sun/Moon allocation reverses between odd and even signs. A complete D2 chart also needs a named layout rule; Rao explicitly calls his introductory Hora account incomplete.
At a glance
- Part size
- 15°
- Odd signs
- First half Sun; second half Moon
- Even signs
- First half Moon; second half Sun
- Named local mapping
- Sun Hora → Leo; Moon Hora → Cancer
How is a D2 Hora placement calculated?
Count signs from Aries as one: Aries, Gemini, Leo, Libra, Sagittarius and Aquarius are odd. Their first half is Sun Hora and second half Moon Hora. Taurus, Cancer, Virgo, Scorpio, Capricorn and Pisces reverse that allocation.
OpenFate’s locally reviewed calculation maps Sun Hora to Leo and Moon Hora to Cancer. This is a declared implementation, not proof that every school’s D2 chart uses only those signs. Rao §6.2.2 supports the allocation but warns that its explanation is incomplete.
What happens exactly at 15°?
At Aries 14°59′ the allocation is Sun Hora, mapped to Leo in the named implementation. At Aries 15°00′ it becomes Moon Hora, mapped to Cancer. The exact boundary belongs to the second half; rounding first can hide the change.
For Taurus the same test reverses: 14°59′ is Moon Hora/Cancer and 15°00′ is Sun Hora/Leo. These are artificial boundary inputs, not birth observations. The example checks parity and half assignment without claiming that resources change at that instant.
Can a Hora chart tell me how wealthy I will be?
Rao’s chart-domain table associates D2 with money and resources, but that tradition does not verify assets, income or investment returns. Keep a resource question separate from account records and practical financial decisions; do not turn a Sun/Moon label into a wealth score.
When an app disagrees, compare the complete Hora method, source longitude and rounding before interpreting the difference. If birth time leaves the D2 ascendant uncertain, withhold its house conclusions. A different Hora method must not be presented as an available app setting without verification.
Sources and editorial basis
- P. V. R. Narasimha Rao: Vedic Astrology — An Integrated ApproachRao, Vedic Astrology: An Integrated Approach. §6.2.2, p. 52: 15° Sun/Moon Hora allocation by natal-sign parity, explicitly described by the author as incomplete; §6.3 / Table 11, pp. 60–61: traditional resource domain. This passage does not document every D2 layout or the OpenFate implementation. 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.