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Acknowledgements
Moon libration data for the years 2020-2022 comes from NASA's Scientific Visualization Studio.
mooninfo_2020.txt comes from: Moon Phase and Libration 2020
mooninfo_2021.txt comes from: Moon Phase and Libration 2021
mooninfo_2022.txt comes from: Moon Phase and Libration 2022
These Moon Phase and Libration pages contain some wonderful videos, images, and explanatory text that help make the complexities of the Moon's orbit and libration understandable.
Further Reading
The PDF document Computation of the Quantities Describing the Lunar Librations in The Astronomical Almanac provides a detailed explanation of the meaning of lunar libration quantities like sub-solar angles, sub-earth angles, and polar position angles.