August 4, 2026 D. Arnas, R. Linares “Approximate Analytical Solution to the Zonal Harmonics Problem Using Koopman Operator Theory” Journal of Guidance Control and Dynamics [07315090] 44.11 (2021): 1909-1923. Print. Share this 44.11 (2021): 1909-1923. Print."] Related Stories See all news Anushka Tahiliani earns AIAA honor for propulsion modeling work with Electra.aero’s NASA AACES 2050 team Three from AeroAstro awarded 2026 Amelia Earhart Fellowships See all news