1. المركز الثقب الَّذي الخَيط بِهِ

    وَقَد يسمّى قطباً فاِنتبِه

    The center is the hole with the thread in it.

    And it is sometimes called a pole, so take heed.

  2. وَقَوس الاِرتفاع ما تُحيطُ

    بِالربع مِن دائِرَة خُطوط

    And the arc of altitude is that which surrounds

    the quadrant—the lines of a circle.