Amogh N P
✦ In loving memory of Amogh N P — Architect · Designer · Visionary ✦
The central courtyard of a traditional Kerala nalukettu — timber galleries around an open-to-sky court that lights, ventilates and drains the deep plan.
Unit IIIVastu & Traditional Indian Architecture

Measurement, Proportion & Planning

The cubit, the ayadi numerology, and the courtyard house.

≈ 40 min + studio task

Traditional Indian measure is anthropomorphic — built up from the angula (finger) to the hasta (cubit), the working design module, keeping buildings human-scaled. Learn the units and the tala proportional system; the ayadi/aaya-shadvarga checks (the traditional numerological dimensioning method, taught accurately and named as such); the directional zoning of the house (kitchen SE, water NE, master SW) with its climate reading; and the courtyard house — the clearest case of tradition and building science coinciding.

Learning objectives

By the end of this lesson, you will be able to — mapped to the course outcomes for Vastu & Traditional Indian Architecture:

1
CO3 · Understand

Explain the anthropomorphic units (angula, hasta) and the tala proportional system.

2
CO3 · Understand

Describe the ayadi/aaya-shadvarga checks and name them as numerology.

3
CO3 · Apply

Apply directional room zoning and read the climate logic of each placement.

4
CO6 · Analyse

Separate the recoverable modular proportion and climate zoning from the belief layer.

Angula, hasta, tala — and the ayadi

Measure & proportion

Body-derived units keep buildings human-scaled (recoverable craft); the ayadi auspicious checks are numerology, taught accurately and named as belief.[1, 2]

Measure from the body angula finger vitasti (span) ≈ 12 angula hasta (cubit) ≈ 2 vitasti the principal working design module Ratios vary by text/region (the 24-angula hasta is common). Body-derived measure keeps buildings human-scaled — a genuine, recoverable virtue.
DiagramThe anthropomorphic units — angula to vitasti to hasta, derived from the body

Angula to hasta

Measure is derived from the body, keeping proportion human-scaled. The base unit is the angula (finger-breadth); a common scheme is 8 yava (barley-grains) ≈ 1 angula, 12 angula ≈ 1 vitasti (span), 2 vitasti ≈ 1 hasta (the cubit, elbow-to-fingertip) — the principal working module. (Exact ratios VARY by text and region — the 24-angula hasta is common but not universal.)[1, 2]

The ayadi (aaya-shadvarga) checks Aaya — gain Vyaya — loss Yoni — orientation Nakshatra — star Vara — weekday Tithi — lunar day chosen length → arithmetic → seek a FAVOURABLE REMAINDER ⚠ numerology — no building-science basis Taught accurately as the traditional dimensioning method — and named clearly as belief-based number-lore.
DiagramThe ayadi aaya-shadvarga six checks run as remainder arithmetic, flagged as belief-based numerology
Where tradition meets climate

Directional planning & the courtyard

The house zoned by direction is mostly sound climate design; the courtyard house is where tradition and building science coincide.[1, 5]

The house zoned by direction water / wellNE kitchenSE · Agni master /storeSW open / studyN–NW court Belief assigns the deity; the climate reading explains the comfort — most of this zoning is sound for the Indian sun & wind.
DiagramA traditional house plan zoned by direction — kitchen SE, water NE, master and store SW, around an open central court

The house by direction

Canonical room placement follows the directional scheme, and most reads as sound climate zoning: kitchen SE (Agni → morning light + heat/smoke exhaust), water/well NE (purity → water in the cool, gently-lit, draining quarter), master bedroom SW (stability → behind the heavy mass that shades the worst sun), heavy store SW (heavy quarter → mass as a thermal buffer). Belief assigns the deity; the climate reading explains the comfort.[1]

Recoverable craft vs belief

At a glance

ElementTraditionHonest reading
Angula / hasta measureTradition: sacred body-derived unitsHonest reading: sound human-scaled module (recoverable)
Modular whole-number sizingTradition: auspicious dimensionsGenuine modular coordination (recoverable)
Ayadi / aaya-shadvargaTradition: a lucky remainder selects the sizeNumerology; no building-science basis (belief)
Kitchen SE, water NE, master SWTradition: deity quartersMostly sound climate zoning for the Indian sun/wind
Courtyard houseTradition: open centre honours BrahmaDaylight + cross/stack ventilation (recoverable)
Vocabulary

Key terms

Angula

Finger-breadth — the base unit of traditional measure.

Hasta

The cubit (elbow-to-fingertip) — the principal working design module.

Tala

A proportional/iconometric module based on the face/palm, dividing a whole into equal parts.

Ayadi (aaya-shadvarga)

The six auspicious dimensional checks — a numerological, belief-based method.

Courtyard house

A dwelling planned around an open central court — the climate-functional traditional type.

Thermal mass

Heavy material that stores and slows heat — the building-science benefit of thick traditional walls.

Apply it

Studio task

Plan a small traditional house in hastas around a central courtyard, zoning the kitchen SE, water/well NE and master bedroom/store SW — and write the climate reading for each placement. Separately, describe the ayadi check honestly (how it works, and why it is numerology with no building-science basis). State which parts of the tradition you would keep and which you would name as belief.

Check your understanding

Self-assessment

1. The principal working module for traditional plans is the —

2. The aaya-shadvarga (ayadi) formulae are best described as —

3. The building-science benefit of the traditional central courtyard is mainly —

In a nutshell

Recap

Traditional measure is anthropomorphic — angula to hasta (the working cubit module) — keeping buildings human-scaled.
The tala system fixes proportion by equal subdivision; modular whole-number coordination is recoverable craft.
The ayadi/aaya-shadvarga checks are a numerological dimensioning method — taught accurately, but named as belief.
Directional room zoning (kitchen SE, water NE, master SW) is mostly sound climate design for the Indian sun/wind.
The courtyard house is where tradition and building science coincide — daylight, ventilation, mass and shade.
The evidence

References & further reading

  1. [1]P. K. Acharya, A Dictionary of Hindu Architecture and Indian Architecture according to Mānasāra — measurement & proportion.
  2. [2]Bruno Dagens (trans.), Mayamata — units, the ayadi checks and house planning in a primary source.
  3. [3]V. Ganapati Sthapati, Building Architecture of Sthapatya Veda — the living tradition (read critically for devotional framing).
  4. [4]Stella Kramrisch, The Hindu Temple — proportion and the open centre.
  5. [5]Indian vernacular-architecture literature on the courtyard house (climate function).

Further reading

  • P. K. Acharya — A Dictionary of Hindu Architecture.
  • Bruno Dagens (trans.) — Mayamata.
  • V. Ganapati Sthapati — Building Architecture of Sthapatya Veda (read critically).

Sources gathered and fact-checked June 2026. Published values vary by source, sample and method — treat as indicative and confirm against the cited standard before structural use.