Tweeting History - From July 16, 1969, 9:41:09 EDT
Apollo 11 S-II Second Stage Separation

At 000:09:09.00 GET Apollo 11's second stage S-II separates, its retrorocket motors fire and the ullage motors on S-IVB are ignited to settle its propellants before S-IVB ignition. (Photo from AS-502.)

Image credit: NASA

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