'The Sun and solar phenomena', c 1851.
© Science Museum / Science & Society Picture Library
Astronomical diagram drawn and engraved by John Emslie, showing the Sun, its comparative size as seen from the planets, and the development of sunspots. The smaller surrounding illustrations explain the phenomena of day and night and the difference in the length of daylight in summer and winter, and depict the transit of Mercury, the midnight Sun in the Arctic and an annular eclipse of the Sun. Published by James Reynolds (174 Strand, London).