Today I learned a new definition: Lissajous https://en.wikipedia.org/wiki/Lissajous_curve https://en.wikipedia.org/wiki/Lissajous_curve The sand pendulum drew

Today I learned a new definition: Lissajous https://en.wikipedia.org/wiki/Lissajous_curve https://en.wikipedia.org/wiki/Lissajous_curve The sand pendulum drew lissajous curves as it swung. [I learned it today because they called the ESA Gaia probe's orbit "Lissajous" around the Lagrange point.] https://www.esa.int/Enabling_Support/Operations/Farewell_Gaia!_Spacecraft_operations_come_to_an_end https://www.esa.int/Enabling_Support/Operations/Farewell_Gai...