{"planet":"mars","years":[2025,2026,2027],"source":"astronomy-engine, geocentric tropical longitudes; stations found by bisection on apparent speed","license":"CC0-1.0","page":"https://mychartcheck.com/retrograde/mars/","periods":[{"retrogradeAt":"2027-01-10T13:00:38.661Z","retrogradeSign":"virgo","retrogradeDegree":10.429,"directAt":"2027-04-01T14:11:06.067Z","directSign":"leo","directDegree":20.926,"days":81,"preShadowStart":"2026-11-05","postShadowEnd":"2027-06-08"}]}