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physics.hist-ph2018★ 27 cited
Reconstructed sunspot positions in the Maunder Minimum based on the correspondence of Gottfried Kirch
R. Neuhäuser, R. Arlt, S. Richter
We present reconstructed sunspot positions based on observations reported in letters between Gottfried Kirch and other contemporary astronomers from AD 1680 to 1709, i.e. in the la…
physics.hist-ph2011★ 43 cited
The sunspot observations by Samuel Heinrich Schwabe
R. Arlt
A long time-series of sunspot observations is preserved from Samuel Heinrich Schwabe who made notes and drawings of sunspots from 1825-1867. Schwabe's observing records are preserv…