Spacecraft that docked with the Soyuz in 1975 (6)

I believe the answer is:

apollo

(Other definitions for apollo that I've seen before include "US space project, 1960-72" , "Greek (and Roman) god of light, poetry etc" , "Programme targeting satellite" , "Greek god - US space programme dedicated to moon landings - butterfly" , "Japanese dish" .)

I've seen this clue in The New York Times.

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