BUZZ ALDRIN'S FLOWN GEMINI XII CHECK LIST.

BUZZ ALDRIN'S FLOWN GEMINI XII CHECK LIST.
CDH Maneuver check list, 2 pp, recto and verso, November 1966, 8 x 10 1/2 inches. Detailed notes in pencil by Buzz Aldrin, signed in ink on both sides by Aldrin and with "Flown on Gemini XII" on one side, white Velcro tab at one corner. With a Typed Letter Signed by Buzz Aldrin.

Gemini XII, crewed by Edwin "Buzz" Aldrin and James Lovell, Jr. was the final manned flight of Project Gemini. The crew's main objective was to prove that astronauts could effectively work outside of a spacecraft. Aldrin performed three EVAs on the mission and the crew were able to dock with an Agena target vehicle.

Aldrin, in the accompanying letter, explains the above chart, in part: "This car was carried on the flight of the Gemini XII during November 1966. One side lists separate procedures for Command Pilot James Lovell and myself to begin the rendezvous with the Agena target vehicle. The opposite side has a spreadsheet type grid where I logged over 20 numeric entries for various rendezvous events.
CDH (Constant Differential Height) was part of the rendezvous maneuvers required to link-up with the Agena target vehicle. The CDH burn was used to circularize the Gemini spacecraft orbit with the Agena target vehicle, important to do if back-up techniques such as visual sightings and chart use was [sic] required for computing an intercept maneuver. This turned out to be the case on Gemini XII due to an onboard computer failure. I had to do most of the computations myself, which turned out to be [a] successful test of my doctorate skills from MIT."