Leonardo da Vinci’s notebooks: http://www.fromoldbooks.org/Richter-NotebooksOfLeonardo/section-14/item-902.html
A reference to Humboldt in 1774: http://www.britastro.org/journal/pdf/120-4forum.pdf also, Kepler and Galileo.
A blog about a telescopic system at the Mauna Loa Observatory on Hawaii to determine terrestrial albedo by earthshine observations. Feasible thanks to sheer determination.
Leonardo da Vinci’s notebooks: http://www.fromoldbooks.org/Richter-NotebooksOfLeonardo/section-14/item-902.html
A reference to Humboldt in 1774: http://www.britastro.org/journal/pdf/120-4forum.pdf also, Kepler and Galileo.
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