Reference for Eruvin 111:4

תנו רבנן בא לרבעה מרבעה בריבוע עולם נותן צפונה לצפון עולם ודרומה לדרום עולם וסימניך עגלה בצפון ועקרב בדרום

the sides of the square must be made to correspond to the four directions of the world: Its northern side, [for instance,] must correspond<span class="x" onmousemove="('comment',' Lit., 'gives'.');">⁷</span> to the North, and its southern side to the South; and your guiding marks<span class="x" onmousemove="('comment',' In ascertaining the directions. vkdg');">⁸</span> are the Great Rear<span class="x" onmousemove="('comment',' , lit., 'wagon'.');">⁹</span>

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