قَوس الِارْتفَاع: هِيَ الْخط الْمُحِيط للربع الْمُجيب الْمَقْسُوم على (ص) أَي على تسعين دَرَجَة أقساما مُتَسَاوِيَة من أول الْقوس وَهُوَ الْجَانِب الَّذِي يكون فِي يمنيك إِلَى آخرهَا وَهُوَ الْجَانِب الَّذِي يكون فِي يسارك وَبِالْعَكْسِ أَي من آخر الْقوس إِلَى أَولهَا وَإِنَّمَا قسموا قَوس الرّبع الْمُجيب على تسعين لِأَن خطّ معدل النَّهَار مقسوم على ثَلَاث مائَة وَسِتِّينَ دَرَجَة فربعها تسعون.
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