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set of procedures, counted in inverse numerical order, leading to the launching of a rocket, ajaühikute pöördloendamine enne stardihetke
countdown 1 . Kosmoseteaduse ja -tehnoloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kth/countdown/1/eng (03.07.2026)