Contents
1
Prelude and Framework
1
2
Boarding School and University
9
2.1 Barneveld
11
2.2
Utrecht
16
2.3 Vibrating Flat Membranes
20
2.4 Catherina Elisabeth Kalshoven
24
3
Astronomy Around 1875
27
3.1
Astronomy of the Solar System
27
3.2
Higher Parts of the Heavens
31
3.3 The Construction of the Heavens
40
4
Observator and Professor
45
4.1 The Sterrewacht Leiden
46
4.2 Professor in Groningen
52
4.3 Without an Observatory
55
4.4
Marriage
56
5
Nearly Half a Million Stars
65
5.1 Tree Rings and Mathematical Series
66
5.2
Kepler’s Equation
68
5.3 Positions and Parallaxes of Stars
69
xix
1
Prelude and Framework
1
2
Boarding School and University
9
2.1 Barneveld
11
2.2
Utrecht
16
2.3 Vibrating Flat Membranes
20
2.4 Catherina Elisabeth Kalshoven
24
3
Astronomy Around 1875
27
3.1
Astronomy of the Solar System
27
3.2
Higher Parts of the Heavens
31
3.3 The Construction of the Heavens
40
4
Observator and Professor
45
4.1 The Sterrewacht Leiden
46
4.2 Professor in Groningen
52
4.3 Without an Observatory
55
4.4
Marriage
56
5
Nearly Half a Million Stars
65
5.1 Tree Rings and Mathematical Series
66
5.2
Kepler’s Equation
68
5.3 Positions and Parallaxes of Stars
69
xix