वास्तु मण्डन (मण्डन सूत्रधार - गृह, राजप्रासाद, दुर्ग एवं नगर-वास्तु सटीक)

Chapter II
[Āyādhikāraḥ]
Now is described the command of Āya.

1. One should have proper knowledge about the place of Āya, Vyaya,
   and the power of lunar asterism; then the householder will
   build a house in order to obtain wife, children and wealth.
2. The Āya formula should be counted from the inner part of the
   foundation wall for a house; it should be counted from the
   outer part of the foundation wall for a palace. For a hall it is to
   be counted from inside, as well as from outside, and for beds
   and seats it should be counted from inside.
3. A city, town or village should be measured with the help of a
   Daṇḍa (rod). A plot of land would be measured with the
   Vāstudaṇḍa and the Āya will be counted by the number of hands.
4. The breadth, if multiplied by the length and divided by eight,
   is known as Dhvaja etc. The remainder will be according to the
   foundation of Vāstu and should be added by the hands, finger,
   Yava (1/8th part of an Aṅgula).
5. Dhvaja, Dhūma, Siṁha, Śvā, Vṛṣa, Khara, Gaja, Dhvāṁkṣa, — these
   are eight Āyas, their position starts from the eastern side of the
   construction.
   6-7. All types of human hands, claws of the bird, necks of lions , faces
   according to their name. Dhūma, Mārjāra (Dhūma and cat are
   on the S.E corner) Puruṣa, Dhvaja (Eastern direction), very strong