The Chinese 'sunspot' of 9 December 1874 was probably the transit of Venus, because contemporary heliograms show only tiny sunspots while the Venus silhouette was large and visible from East Asia.
cloud vapour (雲氣)
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A Transit of Venus Possibly Misinterpreted as an Unaided-Eye Sunspot Observation in China on 9 December 1874
The Chinese 'sunspot' of 9 December 1874 was probably the transit of Venus, because contemporary heliograms show only tiny sunspots while the Venus silhouette was large and visible from East Asia.