Revisiting the Amplitude of Solar Cycle 9: the Case of Sunspot Observations by W.C. Bond Original source: V.M.S. Carrasco, M.C. Gallego, R. Arlt, J.M. Vaquero, 2020. FIRST COLUMN - year of the observation SECOND COLUMN - month of the observation THIRD COLUMN - day of the observation FOURTH COLUMN - number of sunspot groups YEAR MONTH DAY GROUPS 1847 8 30 8 1847 8 31 8 1847 9 1 7 1847 9 2 9 1847 9 3 9 1847 9 5 11 1847 9 15 6 1847 9 16 7 1847 9 17 7 1847 9 18 7 1847 9 22 5 1847 9 29 4 1847 9 30 8 1847 10 3 6 1847 10 5 7 1847 10 6 6 1847 10 9 6 1847 10 10 9 1847 10 11 9 1847 10 12 7 1847 10 14 8 1847 10 15 9 1847 10 18 8 1847 10 19 8 1847 10 20 5 1847 10 21 5 1847 10 22 5 1847 10 25 5 1847 10 26 6 1847 10 28 6 1847 10 29 7 1847 10 31 9 1847 11 2 5 1847 11 4 7 1847 11 5 8 1847 11 6 9 1847 11 9 9 1847 11 12 6 1847 11 13 5 1847 11 16 7 1847 11 18 5 1847 11 22 5 1847 11 28 8 1847 11 29 9 1847 11 30 8 1847 12 5 7 1847 12 7 7 1847 12 8 8 1847 12 13 3 1847 12 14 3 1847 12 16 2 1847 12 19 7 1847 12 21 10 1847 12 23 8 1847 12 24 9 1847 12 27 9 1847 12 30 10 1848 1 7 10 1848 1 10 7 1848 1 11 6 1848 1 12 6 1848 1 19 6 1848 1 22 7 1848 1 28 11 1848 2 3 9 1848 2 9 5 1848 2 12 6 1848 2 16 7 1848 2 17 7 1848 2 18 9 1848 2 19 10 1848 2 23 4 1848 2 29 7 1848 3 16 6 1848 3 22 5 1848 3 24 8 1848 3 30 5 1848 3 31 4 1848 4 3 4 1848 4 15 4 1848 4 20 4 1848 4 28 7 1848 5 4 4 1848 5 18 6 1848 5 29 6 1848 6 22 8 1848 6 25 4 1848 6 27 5 1848 7 5 7 1848 8 2 7 1848 8 7 8 1848 8 8 9 1848 8 11 7 1848 8 17 4 1848 8 20 4 1848 8 21 4 1848 8 24 6 1848 9 7 3 1848 9 11 3 1848 9 19 4 1848 9 27 6 1848 10 12 7 1848 10 13 12 1848 10 16 8 1848 10 23 7 1848 10 25 7 1848 11 1 5 1848 11 16 9 1848 11 21 5 1848 11 22 4 1848 12 1 7 1848 12 18 8 1848 12 26 11 1848 12 29 7 1849 1 11 6 1849 1 16 7 1849 1 18 8 1849 1 19 9 1849 2 10 9 1849 2 21 10 1849 3 2 7 1849 3 9 6 1849 3 12 6 1849 3 22 6 1849 5 21 3 1849 6 12 5 1849 7 2 5 1849 7 29 5 1849 9 3 4 1849 11 14 6 1849 11 22 6 1849 12 11 2