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Prompted by a near-approach of the planet Mars to Earth, he devised a celestial signalling system to permit communication with Martians.
If the input data also has a celestial coordinate system then a "virtual" column called CEL_RMID is also added, with the mid-point given in the appropriate units.
Prior to the invention of global positioning devices, people actually relied on constellations in the night sky as a celestial navigation system.
Just as these astronomers gave us a view of the heavens in which no angels were required to propel the planets in their orbs and the earth was no longer the center of the celestial system, so Darwin showed that no God was needed to design the spider's intricate Web and that man is in truth but another animal.
Chandra's X-ray, or high-energy, view of galaxies reveals where the action is in these majestic celestial systems.
As these celestial systems rotate around their dense centre, all of the regular matter that they contain does not have enough mass to account for the gravity needed to hold everything together.
And the planets themselves fell into an arrangement whereby their extreme velocity ratios conformed with the harmonies of the just tuning system, a celestial music without sound.
Planetary systems are much smaller than the distances separating stars at least out in the galactic suburbs where we live making each such system a celestial island unto itself.
That kid has a mighty celestial olfactory system.
By a vote of the astronomers in attendance, the IAU decided that a solar system planet is a celestial body that (1) is in orbit around the Sun, (2) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (3) has cleared the neighbourhood around its orbit.
The year 2061 marks the next return to our solar system of Halley's comet, a celestial body composed largely of carbon-blackened snow and ice.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com