Johann Heinrich Lambert was born #OTD (or 28) in 1728.

Lambert was the first to introduce hyperbolic functions into trigonometry. He invented the first practical hygrometer. In 1760, he published a book on photometry. In Neues Organon, he studied the rules for distinguishing subjective from objective appearances, connecting with his work in optics. And he published his version of the nebular hypothesis of the origin of the Solar System.

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