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accomplished accuracy and precision Ames Research Center angle measurements angular subtense arc sec Astronaut Lousma Astronaut Pogue astronavigator biases brightness cabin gas calibration celestial targets diopter Ephemeris exit pupil eyepiece field of view FLOS hand-held sextant hand-held space sextant hood human performance interplanetary missions Johnson Space Center Kalman Filtering light rays limb-limb Lunar limb-limb line of sight line-of-sight deviations long-mission low earth orbit lunar disk lunar limb Lunar Limb-Diphda Lunar Lunar Limb-Fomalhaut Lunar Lunar limb-limb Lunar Lunar Limb-Nunki Lunar MANUAL NAVIGATION SIGHTINGS mean absolute errors mean error measured angle midcourse navigation moon NASA TN neutral density filters Number optical quality orbit period of weightlessness postmission premission readout refractive reliable Rigel-Pro02on rotated set of sightings sextant field sextant sighting sighting sessions SKYBET SKYLAB EXPERIMENT T00-2 Skylab missions SLOS spacecraft standard deviation T00-2 experiment tangency Target pair transparent shield vertical wardroom window zero zero-bias