A circle on a sphere, such as Earth, that describes locations at the same altitude above a designated level, often used in navigation and cartography.

समान ऊँचाई का वृत्त

English Usage: The navigator plotted a course using a circle of equal altitude.

Hindi Usage: नेविगेटर ने समतल वृत्त का उपयोग कर मार्ग की योजना बनाई।