RADIFI MASNUI ZAMIN (RMZ), apparati parishi kayhoniest, ki ba madori nazdizamini barovarda shudaast. Baroi dar chusin mador harakat kardani RMZ surati onro barobari surati yakumi kayhoni yo khud az on ham ziyodtar kunondan lozim ast. Balandii minimalii parvozi RMZ (perigei mador) 150— 160 km (chunin balandi baroi dar atmosfera favri bartaraf kardani tormozkhuri zarur ast) buda, balandii maksimalii parvozi on (apogei mador) sadho hazor km shuda metavonad. Davri gardish az rui mador ba balandii miyonai parvoz vobasta buda, az 1,5 s to yakchand shaboruzro tashkil medihad. RMZ-ro dar tadqiqoti ilmi va halli masalahoi amali istifoda mebarand (masalan, RMZ-i aloqa, RMZ-i moteorologi, RMZ-i navigatsioni, RMZ-i geodezi va gayra). Kishtihoi kayhonii pilotdor va stansiyahoi madori niz mansubi RMZ-and.