| 21. | The celestial sphere of the present Flag of Brazil replaced the armillary sphere in 1889.
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| 22. | The second image to the right represents the u input mapped onto the celestial sphere.
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| 23. | It is the southern hemisphere of the celestial sphere.
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| 24. | This was the part of the celestial sphere hidden from the telescope by the sun.
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| 25. | It is mostly upon the Northern Hemisphere's celestial sphere.
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| 26. | The consensus was that the celestial spheres were made of some kind of continuous fluid.
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| 27. | The celestial sphere measures 410 cm . in diameter and weighs some 5, 800 kg.
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| 28. | The total number of celestial spheres was not fixed.
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| 29. | The GBT is fully steerable, and 85 % of the entire celestial sphere is accessible.
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| 30. | On the celestial sphere, this star lies about half a 4th magnitude star Eta Cygni.
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