English Translation
On the same day, Apollo 11 succeeded in landing on the moon’s surface.
The verb in this sentence should be in the passé composé or the passé simple, as it is a one-off action.
Not necessarily; we are clearly missing some context (the same day as what??), but the sentence is fine as is.
The imparfait is used to indicate a secondary action (or happening) that is ongoing at the time of the main action (cf here ), in this case to indicate that, on the same day of whatever the main action was, the moon landing was a thing
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