Fig. 1.0 Map of the Netherlands around 1900. The capital letters indicate the location of towns and cities with special significance to Kapteyn: B = Barneveld, where
he was born and grew up; U = Utrecht, where he went to university; L = Leiden,
where he first worked as an astronomer; G = Groningen, where he was a professor at the university for more than 40 years; V= Vries, where the Kapteyns owned
a second house; H = Hilversum, where he and his wife bought a house to live after retirement and A = Amsterdam, where he was nursed during his fatal illness and
died. Other cities and villages that occur in this book are in lowercase: al=Alkmaar,
am=Amersfoort, ap=Apeldoorn, ar=Arnhem, as=Assen, bo=Bodegraven, br=Breda,
de=Delft, hg=Den Haag, he=Den Helder, do=Dordrecht, ei=Eindhoven, en=Enschede,
fr=Franeker, hl=Haarlem, hw=Harderwijk, go=Gouda, le=Leeuwarden, ma=Maastricht,
ro=Rotterdam, vl=Vlissingen, wa=Wageningen and zw=Zwolle. Adapted from ‘Kaart
Nederland Jan clip art’ [21]