celestial horizon
- n the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
celestial horizon :
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- Dwarf Planet Ahoy! Spacecraft Spies Pluto and Charon
astroengine writes "As NASA's New Horizons probe powers through interplanetary space, it's keeping a careful eye forward, watching its target gradually loom larger on the proverbial celestial horizon. But earlier this month the spacecraft spotted something right next to Pluto — a pixelated Charon, the dwarf planet's largest moon. 'The image itself might not look very impressive to the untrained ...
July 10, 2013 - Slashdot