Sunspots during the Maunder Minimum from Machina Coelestis by Hevelius

V. M. S. Carrasco, J. Villalba Álvarez, J. M. Vaquero

We revisited the sunspot observations published by Johannes Hevelius in his book Machina Coelestis (1679) corresponding to the period 1653-1675 (just in the middle of the Maunder M…