Karmandir 
About
The Navagraha Yantra brings the nine graha squares together in one large square of 81 cells. Each block of nine cells is one graha's yantra, and the blocks sit in the directions the Matsya Purana (93.11–12) gives for the Navagraha mandala: Surya in the centre, Shukra in the east, Mangal in the south, Shani in the west, Guru in the north, Chandra in the south-east, Rahu in the south-west, Ketu in the north-west and Budh in the north-east. The drawing has east at the top. Families keep it where all nine grahas are remembered together, and the NCERT maths book Ganita Prakash shows it as an example of Indian magic squares.
Parts of the yantra
Nine blocks of nine cells, one block for each graha. With east at the top, north falls on the left and south on the right. Top row (east side): Budh in the north-east (4 to 12, total 24), Shukra in the east (6 to 14, total 30), Chandra in the south-east (2 to 10, total 18). Middle row: Guru in the north (5 to 13, total 27), Surya in the centre (1 to 9, total 15), Mangal in the south (3 to 11, total 21). Bottom row (west side): Ketu in the north-west (9 to 17, total 39), Shani in the west (7 to 15, total 33), Rahu in the south-west (8 to 16, total 36). Thick gold lines separate the graha blocks, thin saffron lines mark the cells, and a double border closes the yantra. The numbers are written in Devanagari digits.
How to use it
Place the yantra upright on a clean cloth in the puja place, with the east side (Budh, Shukra, Chandra) at the top. Light a diya, offer a flower and sit quietly facing it. Read the Navagraha Stotram once, verse by verse, and while reading each verse rest your eyes on that graha's block: Surya in the centre first, then Chandra, Mangal, Budh, Guru, Shukra, Shani, Rahu and Ketu. End with a prayer for peace and good sense for the whole family. Wipe the yantra with a soft, dry cloth to keep it clean.
The NCERT figure writes each graha's name in its block and draws every square inside a shape for that graha (for example a triangle for Mangal and an arrow for Budh). Some websites put the nine squares in another order without following the directions (aghori.it, for example, has Guru, Chandra and Mangal in the top row); this drawing follows the Matsya Purana. Many prints use the digits 1, 2, 3 instead of Devanagari digits.
