Diagram of position of Earth
Venus and Jupiter when the two planets are seen near together. Jupiter revolves in 12 years Venus in 8 months
[annotated diagram of relative positions of earth, Venus and Jupiter, with the position of Jupiter March 1892 labelled]
Next September and October Jupiter will be nearest us & opposite the sun - [therefore] seen at midnight. Venus can never be opposite the Sun, but is seen only at morning or evening.
For enquiries about the Wallace Collection please email the library
View high resolution scans and transcripts of Alfred Russel Wallace's correspondence, including all surviving letters between him and Charles Darwin.