1. https://griechische-mythologie.fandom.com/wiki/Ikarus.

2. https://griechische-mythologie.fandom.com/wiki/Phaeton; https://www.theoi.com/Titan/Phaethon.html.

3. http://scihi.org/friedrich-wilhelm-bessel/.

4. http://www.hellenicaworld.com/Greece/Science/en/ArchimedesSand.html.

5. Osborne, Catherine (1983 ): Archimedes on the Dimensions of the Cosmos. The University of Chicago Press, Jg. 74 , Nr. 2 , S. 234 –242 .

6. http://www.mathpoint.ch/09 potenzen/potenzen.html.

7. https://www.ucolick.org/~laugh/reckoner.shtml.

8. Harrison, Edward R. (1972 ): The cosmic numbers. Physics Today 25 , Jg. 12 , Nr. 30 , https://physicstoday.scitation.org/doi/10 .1063 /1 .3071139 .

9. https://lateinon.de/kultur/zitate/noli-turbare-circulos-meos/.

10. Singham, Mano (2007 ): Columbus and the Flat Earth Myth. The Phi Delta Kappan, Jg. 88 , Nr. 8 , S. 590 –592 .

11. Jeffrey Burton Russell erforscht diesen Konflikt in seinem Buch Inventing the Flat Earth: Columbus and Modern Historians , Praeger Publishers 1997 .

12. https://www2 .latech.edu/~bmagee/212 /columbus/columbus_notes.htm.

13. Lehmann, F.W. Paul (1921 ): Amerigo Vespucci als Kosmograph und Nautiker. Geographische Zeitschrift, Jg. 27 , Heft 7 /8 , S. 145 –154 .

14. http://ircamera.as.arizona.edu/NatSci102 /NatSci102 /text/extmayaastronomy.htm.

15. Ferreiro, Larrie D. (2011 ): Measure of The Earth: The Enlightenment Expedition That Reshaped Our World. Basic Books, S. 193 .

16. Ferreiro, Larrie D. (2011 ): Measure of The Earth: The Enlightenment Expedition That Reshaped Our World. Basic Books, S. 222 .

17. https://travelpello.fi/en/expedition-of-maupertuis-to-lapland-determine-shape-of-earth/.

18. https://scienceblogs.com/principles/2013 /06 /20 /singular-oddities-of-character-cavendish-and-dirac oder: Jungnickel, Christa/McCormmach, Russel (1999 ): Cavendish. The Experimental Life. Bucknell University Press, S. 304 .

19. Jungnickel, Christa/McCormmach, Russell (2016 ): Cavendish. The Experimental Life. Second revised edition. Max-Planck-Gesellschaft zur Förderung der Wissenschaften, S. 436 .

20. https://www.virtual-maxim.de/wie-bestimmt-man-die-erdmasse/.