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Exploring the ancient world of mathematics. चन्द्रो जलमर्कोऽग्निर्मृद्भूश्छायापि या तमस्तद्धि |
छादयति शशी सूर्यं शशिनं महती च भूच्छाया ||
[आर्यभाटीय, गोलपादः 37]