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Episode 1 of a sailing meteorology course taught by instructor Riccardo Mainardi, with virtual assistant Maya, covers the composition and structure of Earth's atmosphere as a foundation for understanding wind and weather at sea.▶ 0:00 The atmosphere is presented as an analogy to living on the ocean floor — air, like water, has mass and exerts pressure.▶ 1:35 Maya explains that air consists of roughly 78% nitrogen and 21% oxygen, with trace gases including argon and carbon dioxide.▶ 2:19 The atmosphere is divided into layers: the troposphere, where clouds, storms, and all weather relevant to sailors form; the stratosphere, which contains the ozone layer; and higher layers — mesosphere, thermosphere, and exosphere.▶ 3:03 The course frames atmospheric pressure and the weight of air as the physical mechanism that drives wind and, by extension, moves sailboats.▶ 3:49 The lesson closes with a preview of Episode 2, which will cover the sun as the engine behind all atmospheric motion.▶ 4:35

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