After bhoomi vibhajan the 45 Vastu devtas are marked by angle: the 32 outer devtas at 11.25 degrees each in the Pishach bhoomi, four main inner devtas at 54 degrees and eight others at 18 degrees in the combined Manushya and Dev band, and Brahma in the centre.
In the 81 pad (9 x 9) Vastu mandala the ati marma are found by drawing six lines between pairs of outer devtas: the two corner diagonals and two lines parallel to each of them. Their nine crossing points are the ati marma.
When the lord whose colour you need is debilitated, trace the chain of sign lords to the planet that cancels the debility and use its colour instead, creating a neech bhang raj yoga yourself.
A small havan at the Shikhi pad with a teaspoon of desi cow ghee mixed with a spoon of shali dhan, offered as nine aahutis with the devta's mantra, multiplies the energy of Shikhi.
Bhog samagri is offered devta by devta, always starting with Indra (E4) and moving through Agni, Yama, Nairiti, Varun, Vayu, Kuber and Ishan through all 45, then to the 4 guardian devtas who protect them on the four sides.
Items placed under the ground at bhoomi poojan or shilanyas, such as the naag-nagin pair, the foundation stone (shila) and the kalash, and treatment items such as pyramids or silver and gold nandavart, give results only when set at water level (zero degree).
On a paper map, draw a straight line from the centre toward the side that was measured and write the reading on it. A Shakti chakra with printed degrees is laid so that the measured degree sits on that line, and North then falls into place; with a plain protractor, North is marked by counting the degrees back.
Gomti chakra bought from a shop are washed with gangajal, shown fire through a havan or burning camphor, then given a command and energised with mantra. Only then do they carry out the work assigned to them.
The full purification done where a bone has been dug out, the land's equivalent of the rites after a death: vastu registry with five coconuts, removal of the affected soil, agni sanskar with mango wood, water, gomutra and cow-dung purification, lime and sulphur, a 24-hour lamp and mercury.
After a birth or death in the family (sutak or patak) the Vastu devtas are affected too, so the whole house is purified: clothes are washed, raw clay vessels are thrown away, a dhoop kund is carried through the house and offerings are made to the Vastu devtas.
After demolition or the removal of a defect, a short Vastu pooja is done even when a full one is not possible: offer 45 small pieces of gud to the 45 devtas, or at least invoke the nine lords of the directions and the centre with the words Bho [name] Vastu Dev Vastu Shanti Kuru Kuru.
A magnetic compass with a straight side edge, set so that its North-South line, mirror line and axis line coincide, is placed parallel to a straight wall on a level, metal-free surface and read from directly above. The offset of the red needle from the compass North gives the tilt of the building.
If the foundation stone (shilanyas) has been laid in the wrong direction, the earlier shilanyas is formally dissolved and a fresh one is performed in a new auspicious muhurta.
A peepal that sprouts by itself in the house is moved while still small: the deity in it is requested to move, an offering is made, cow urine is poured at the roots and it is replanted in a forest.
Sagun means doing an act while holding the breath. A lamp lit in sagun burns many times longer on the same ghee, and a shankh blown in sagun with a wish in mind drives negative energy out of the house.
Blowing a conch sends the energy of the body's 72,000 nadis through the calcium phosphate particles of the shankh into the air, driving negativity out of the whole house or factory and removing bhoot-pret badha.
When a plan arrives rotated on the paper or PDF, first turn the paper or PDF until one straight side of the plan is truly straight, even if the paper then sits tilted. Take that wall's degree, complete the whole zoning in that position, and only then turn the page back.
Filling soil should come only from fertile fields or mountains, never from polluted or inauspicious places, and should be taken after giving a coconut and asking permission of the place's devta.
In an irregular plot, ignore the slanting side and take the degree of any side that runs straight in the map, parallel to the edge of the paper. The tilt found from that side is then applied to zone the whole plot.
The tilt of a house is read on Google Earth with the ruler tool and then transferred to the paper map as a north line drawn from the centre. On an irregular plot that line is drawn parallel to the wall whose degree was taken.
A well older than 25 years is a pujya (revered) seat of Varun devta and must never be filled in without a vidhi: transfer its deities into a coconut, lower a kalash, fill it with river sand and soil, and leave the coconut in a working well.
Mustard carries the energy of every hand that touched it, so it is washed or rubbed in a wet cloth and then energised with the raksha mantra, dipping two fingers into it or holding it in the fist. The same mantra energises gomti chakra.
Vastu pooja is the prana pratishtha of a house: just as an idol is not worshipped until its prana pratishtha, a house is established only through Vastu pooja. It is due at fixed stages of construction and again whenever the house is disturbed.
Every reading is compared with the nearest cardinal direction: North 0 or 360, East 90, South 180, West 270. The difference is the tilt, stated as North tilted so many degrees toward East (to the right) or toward West (to the left).
For an irregular plot, measure the degree of one wall or axis, draw a line through the centre parallel to that wall, set off the measured tilt to get exact North, and then mark the zones as usual.
In AutoCAD, draw a closed polyline around the plan to get its geometric centre, place the chakra image there, align its North with the plan and rotate it by the measured tilt.
The logic used on paper works the same in AutoCAD, Corel or any drawing software: scale the house outline by the bhoomi ratios, divide by angles, and keep a ready template of the chakra and devta lines to overlay on every new map.