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I used Cassini's Laws to derive an approximate solution to the Moon's rotation axis. The error is on the order of 5 arcminutes. I still need to correct for physical libration. I also need to find test data for the Moon's prime meridian so that I can implement the spin angle calculation. (I could use test data for all the planets' spins, for that matter.)
23 lines
1.1 KiB
Markdown
23 lines
1.1 KiB
Markdown
# Acknowledgements
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Moon libration data for the years 2020-2022 comes from NASA's Scientific Visualization Studio.
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[mooninfo_2020.txt](https://svs.gsfc.nasa.gov/vis/a000000/a004700/a004768/mooninfo_2020.txt)
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comes from: [Moon Phase and Libration 2020](https://svs.gsfc.nasa.gov/4768)
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[mooninfo_2021.txt](https://svs.gsfc.nasa.gov/vis/a000000/a004800/a004874/mooninfo_2021.txt)
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comes from: [Moon Phase and Libration 2021](https://svs.gsfc.nasa.gov/4874)
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[mooninfo_2022.txt](https://svs.gsfc.nasa.gov/vis/a000000/a004900/a004955/mooninfo_2022.txt)
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comes from: [Moon Phase and Libration 2022](https://svs.gsfc.nasa.gov/4955)
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These Moon Phase and Libration pages contain some wonderful videos, images, and explanatory text that
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help make the complexities of the Moon's orbit and libration understandable.
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# Further Reading
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The PDF document [Computation of the Quantities Describing the Lunar Librations
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in The Astronomical Almanac](https://astro.ukho.gov.uk/data/tn/naotn74.pdf) provides a
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detailed explanation of the meaning of lunar libration quantities like sub-solar angles,
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sub-earth angles, and polar position angles.
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