Author

Year of publication

NH (˚C)

SH (˚C)

Earth* (˚C)

Dove [ 19 ]

1852

15.5

-

-

Schoch [ 20 ]

1856

15.1

14.9

15.0

Satorius von Waltershausen [ 21 ]

1865

-

15.8

-

Ferrel [ 12 ]

1877

15.3

16.0

15.7

Spitaler [ 10 ]

1885

15.4

14.8

15.1

von Hann [ 28 ]

1882

-

15.4

-

von Hann [ 15 , 16 ]

1897/1903

-

14.7

-