In early modern times, solar eclipses were feared events that gave rise to much astrological speculation, even though these events could already be predicted long in advance. Around 1700, the situation was already different. Astrology had lost its status as a science and had largely been pushed out of the universities. On the other hand solar eclipses had become very important for cartography. From the beginning and end times of the eclipse at different locations, the differences of their geographical coordinates (...) could be calculated. The changed situation can be illustrated perfectly by the eclipses of August 12, 1654 and May 12, 1706. Whereas in 1654 there were still many astrologically influenced warnings, in 1706 there was great calm in this respect, and instead numerous astronomers tried to record the event correctly and compare their results with those of other observers. (shrink)

The margravial court astronomer Simon Marius, was involved in all of the new observations made with the recently invented telescope in the early part of the seventeenth century. He also discovered the Moons of Jupiter in January 1610, but lost the priority dispute with Galileo Galilei, because he missed to publish his findings in a timely manner. The history of astronomy neglected Marius for a long time, finding only the apologists for the Copernican system worthy of attention. In contrast the (...) papers presented on the occasion of the Simon Marius Anniversary Conference 2014, and collected in this volume, demonstrate that it is just this struggle to find the correct astronomical system that makes him particularly interesting. His research into comets, sunspots, the Moons of Jupiter and the phases of Venus led him to abandon the Ptolemaic system and adopt the Tychonic one. He could not take the final step to heliocentricity but his rejection was based on empirical arguments of his time. This volume presents a translation of the main work of Marius and shows the current state of historical research on Marius. (shrink)