Blank greetings card with envelope featuring:

Nevil Maskelyne NPG D14424

© National Portrait Gallery, London

by R. Page, published by G. Jones

In 1761, Maskelyne travelled to St Helena to observe the transit of Venus, using observations from this expedition to illustrate The British Mariner's Guide (1763). The guide gave instructions for finding longitude at sea by lunar distance. Maskelyne then travelled to Barbados on behalf of the Board of Longitude to test a rival source of longitude, a new watch invented by John Harrison. He was appointed Astronomer Royal on his return. Maskelyne's greatest achievement is the annual Nautical Almanac and Astronomical Ephemeris for which... more

Card size: 125mm x 175mm

Images are printed in their original proportions, within a white border.