Manasara 9.151

9.151

uttare dvāra tatsūtrātpratyagghastāvasānakam
caturdikṣu caturdvāraṃ yuktaṃ vā neṣyate budhaiḥ

The northern gate terminates one cubit west of that cord. / Four gates in the four directions are suitable, or they are not desired by the wise;