Ferrer times the same eclipse from Havana, 9 May 1808
Jose Joaquin de Ferrer, Transactions of the American Philosophical Society vol. 6: contact times for the lunar eclipse of 9 May 1808 at Havana, with a note that the beginning and end were uncertain by a minute and a half 'on account of the strong penumbra'. Timings only, no colour. A second witness that the May 1808 eclipse was ordinary.
How it connects
This clue from people supports this hunch
Lunar eclipses could date the 1808 eruption, if someone in the Americas described the November 1808 one timing only
This clue from people is a clue for
1808 mystery eruption
This clue from people we read it in
Transactions of the American Philosophical Society vol. 6 (1804 to 1809), including Ferrer's observations at Havana
This clue from people came from this step
Started the 1808 mystery eruption