...Principa.

An excellent discussion of the historical development of Newtonian mechanics, as well as the physical and philosophical assumptions which underpin this theory, is given in The Discovery of Dynamics: A Study from a Machian Point of View of the Discovery and the Structure of Dynamical Theories, J.B. Barbour (Oxford University Press, Oxford UK, 2001).

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... year.

M.G. Stewart, American Jou. Physics 73, 730 (2005).

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... yields

Ellipsoidal Figures of Equilibrium S. Chandrasekhar (Yale University Press, New Haven CT, 1969).

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... tensor.

A tensor is the two-dimensional generalization of a vector. However, for present purposes, we can simply think of a tensor as another name for a matrix.

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... years.

Note that this precession rate is about $10^4$ times greater than any of the planetary perihelion precession rates discussed in Section 5.4.

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... month,

A synodic month, which is $29.53$ days, is the mean period between successive new moons.

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