The science and practice of measuring the height or altitude of objects, especially using instruments like altimeters.
From Latin 'altus' meaning 'high' and Greek '-metria' meaning 'measurement,' literally 'the measurement of height.'
Altimetry was revolutionized by satellite technology—modern satellites can measure Earth's elevation so precisely they've discovered that mountains are actually sinking due to glacial melting, revealing the planet's dynamic nature in real-time!
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