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navigation × 24celestial-mechanics × 5
observational-astronomy × 4
the-moon × 3
history × 3
star × 2
coordinate × 2
artificial-satellite × 2
azimuth × 2
the-sun × 1
orbit × 1
planet × 1
galaxy × 1
solar-system × 1
earth × 1
asteroids × 1
photography × 1
time × 1
positional-astronomy × 1
cmb × 1
pulsar × 1
moon-phases × 1
deep-sky-observing × 1
space-probe × 1
interstellar-travel × 1
