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FA_2_SextantSPACE SEXTANT & TELESCOPE The Apollo sextant was used in Earth and lunar orbit, as well as while en route between Earth and the Moon. It played different roles in each of those contexts: in orbit around the Earth or the Moon, the sextant could be used to compute the spacecraft’s altitude and position; whereas in transit between Earth and the Moon, it could be used to compute the spacecraft’s attitude (orientation), position, and velocity.
FA_2_SextantSPACE SEXTANT & TELESCOPE The Apollo sextant was used in Earth and lunar orbit, as well as while en route between Earth and the Moon. It played different roles in each of those contexts: in orbit around the Earth or the Moon, the sextant could be used to compute the spacecraft’s altitude and position; whereas in transit between Earth and the Moon, it could be used to compute the spacecraft’s attitude (orientation), position, and velocity.
FA_4_IMUINERTIAL MEASUREMENT UNIT The Inertial Measurement Unit (IMU) was used to determine a spacecraft’s location and velocity in space. It made inertial navigation possible. The IMU measures changes in acceleration and orientation using accelerometers and gyroscopes. The IMU contained 3 gyroscopes, 3 accelerometers, and 3 gimbals; and required 200 watts of power to function.
FA_4_IMUINERTIAL MEASUREMENT UNIT The Inertial Measurement Unit (IMU) was used to determine a spacecraft’s location and velocity in space. It made inertial navigation possible. The IMU measures changes in acceleration and orientation using accelerometers and gyroscopes. The IMU contained 3 gyroscopes, 3 accelerometers, and 3 gimbals; and required 200 watts of power to function.
FA_5_DSKYTHE DISPLAY KEYBOARD (DSKY) The DSKY (pronounced “disky”) served as the interface between the astronaut and the Apollo Guidance Computer. The DKSY sent commands—entered by the pilot—consisting of a limited vocabulary of 99 verbs and 99 nouns to the computer to enter software programs for different mission segments, and to display and load data required by those programs.
FA_5_DSKYTHE DISPLAY KEYBOARD (DSKY) The DSKY (pronounced “disky”) served as the interface between the astronaut and the Apollo Guidance Computer. The DKSY sent commands—entered by the pilot—consisting of a limited vocabulary of 99 verbs and 99 nouns to the computer to enter software programs for different mission segments, and to display and load data required by those programs.
FA_6_AGCAPOLLO GUIDANCE COMPUTER (AGC) BLOCK II The Block II Apollo Guidance Computer (AGC) was the first portable digital computer invented for the Apollo program. The AGC was installed on board each Apollo command module (CM) and lunar module (LM). The AGC computed guidance and navigation data and provided electronic interfaces for control of the spacecraft.
FA_6_AGCAPOLLO GUIDANCE COMPUTER (AGC) BLOCK II The Block II Apollo Guidance Computer (AGC) was the first portable digital computer invented for the Apollo program. The AGC was installed on board each Apollo command module (CM) and lunar module (LM). The AGC computed guidance and navigation data and provided electronic interfaces for control of the spacecraft.
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