Lunar flown double-sided page from the Apollo 16 Lunar Module Timeline Checklist carried to the surface of the moon aboard the LM Orion, 10.5 x 8.5, consisting of pages 23 and 24, dated March 10, 1972, signed and flight-certified on the front side in blue ink, "This page is from the Apollo 16 LM Timeline Checklist. It shows the procedures used from lunar liftoff to the in orbit HAM or Height Adjustment Maneuver, Charlie Duke, Apollo 16 LMP," who adds above, "This page was on the lunar surface inside our LM Orion for almost 72 hours and was exposed to the vacuum of space during our three moon walks." Page 23 with bottom tab, "Boost Thru Ham," shows the various time integrals and procedures used to ascend from the moon to lunar orbit insertion (INS) and the performance of the HAM. The reverse side, page 24, with top tab, "INS/HAM, Thru CSI," is signed along the bottom in blue ink, "This page shows the procedures from INS/HAM thru CSF or Coelliptic Sequence Initiation." In fine condition. Accompanied by a signed certificate of authenticity from Duke, dated April 25, 2017, in part: "This checklist…was carried to the surface of the moon onboard the Apollo 16 Lunar Module 'Orion.' It was part of our Lunar Module Timeline Checklist which we used to verify that our lunar module systems were in the correct configuration and to verify our operational procedures were correct…this extraordinary checklist page from my personal lunar artifact collection bears silent witness to mankind's first journey to, and exploration of, the magnificent lunar highlands!" After reaching sufficient high orbit following lunar liftoff, the attention of the lunar module crew turns to adjusting its orbit to properly synchronize itself with the CSM. As the LM reaches its pericynthion, it performs a Height Adjustment Maneuver (HAM) which fine-tunes the parameters of the orbit and, consequently, adjusts the relative angles of the two spacecraft. The HAM is a small maneuver that sets the stage for the next stage of the rendezvous. An amazing lunar flown checklist relating to the nerve-racking rendezvous of Apollo modules.
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