... This ``Maunder Minimum'' is not only of interest to solar physicists in the context of the theory of solar magnetic activity, and to stellar astrophysicists working on the properties of cool stars, but may also be a vital clue to the influence of the variability of the Sun's power output on terrestrial climate. ... Without at least partial records of solar behaviour from 1645 to 1715 the whole question of the Maunder Minimum would never have been opened. ... Maunder, E. W. 1890, MNRAS, 50, 251 . ...