The amount of sunlight, or solar radiation, that a location receives makes a big impact on weather conditions, crop success, rainfall and overall climate trends. Today, instruments called pyrheliometers are used to carefully calculate how much sunlight occurs at a particular location, but these instruments weren’t available to quantify sunlight until 1838, and automated pyrheliometers weren’t invented until the early 20th century.
Scientists estimate sunlight in 18th and 19th century Tokyo using historical diaries
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