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Notes
1. See educational video at http://spaceref.ca/missions-and-programmes/nasa/cassini/equinox-at-saturn.html.
2. Telescopes at the time sometimes showed Saturn with handles, either attached to or separated from the planet. For the drawings see http://www.sil.si.edu/DigitalCollections/HST/Huygens/huygens-introduction.htm.
3. The prestigious prize in mathematics awarded by the St John’s College, University of Cambridge.
4. After Edouard Roche; a distance within which, if the particles are considered as fluid, the tides are balanced by self-gravity of the particles.
5. The author’s students have come up with a cool mnemonic: Esposito Great For Astronomy, But Can’t Draw, obviously a crack at his artistic (in)ability.
6. The ratio of the orbital period of the particles to that of the perturbing moon, believed to have induced the formation of objects such as moonlets in the rings.
7. The passing of Uranus in front of the star SAO 158687.
8. A period in the Solar System history when asteroid impacts were rife.
9. See e.g. http://sverre.com/.