16th-century commentaries on Aristotle's treatise on meteoroloy; books from the 17th century on air changes, the sublunary sphere, and on atmospheric optical phenomena; descriptions of natural phenomena such as the volcanic eruption of Mount Etna 1669 or sky changes over the Baltic Sea due to the fire and smoke of battling fleets, published in the late 17th century; publications on the Northern Lights (Aurora Borealis) from the 18th century; books on measuring instruments such as the hygrometer, barometer, or clepsydra from the 17th and 18th centuries