| 单词 | north celestial pole |
| 例句 | For most observers in the Northern Hemisphere, the Great Bear is close enough to the north celestial pole that it never sets below the horizon, and it rotates around the North Star once a day. 5 famous constellations that (almost) anyone can find 2023-08-23T04:00:00Z At this particular time in Earth’s history, there happens to be a star very close to the north celestial pole. Astronomy 2016-10-13T00:00:00Z Through the use of long exposures, the trails depict the rotation of the Earth on its axis centring on the north celestial pole, the sky moving anti-clockwise around this point. The Best Astronomy Pictures of the Year Are Just Incredible 2017-07-28T04:00:00Z But, Polaris just also happens to be the closest bright star relative to the north celestial pole. Most Popular Skywatching Misconceptions Explained 2011-11-14T21:45:00.213Z Stars in an area around the north celestial pole, whose limits vary with the position of the observer never set for an observer in the northern hemisphere. Astronomical Lore in Chaucer 2011-10-13T02:00:42.860Z Continuing his journey towards the south, the north celestial pole sinks below the horizon; the south celestial pole rises above it; or to speak more exactly, the zenith of the observer approaches that pole. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" The north celestial pole appears at an altitude above the horizon that is equal to the observer’s latitude. Astronomy 2016-10-13T00:00:00Z If we extend this imaginary line outward from Earth, the points where this line intersects the celestial sphere are called the north celestial pole and the south celestial pole. Astronomy 2016-10-13T00:00:00Z If you stood at the North Pole of Earth, for example, you would see the north celestial pole overhead, at your zenith. Astronomy 2016-10-13T00:00:00Z For those in the continental United States and Europe, the north celestial pole is neither overhead nor on the horizon, but in between. Astronomy 2016-10-13T00:00:00Z In San Francisco, for example, where the latitude is 38° N, the north celestial pole is 38° above the northern horizon. Astronomy 2016-10-13T00:00:00Z Identify Polaris, the North Star, which lies very close to the north celestial pole. Astronomy 2016-10-13T00:00:00Z As Earth turns, the whole sky seems to pivot about the north celestial pole. Astronomy 2016-10-13T00:00:00Z Recall from the section on celestial poles and the celestial equator that the north celestial pole is just the projection of Earth’s North Pole into the sky. Astronomy 2016-10-13T00:00:00Z And the height of the North Star—the star nearest the north celestial pole—decreases as a traveler moves south. Astronomy 2016-10-13T00:00:00Z If the north celestial pole is wobbling around, then Earth itself must be doing the wobbling. Astronomy 2016-10-13T00:00:00Z What is the altitude of the north celestial pole in the sky from your latitude? Astronomy 2016-10-13T00:00:00Z Hipparchus carried out many astronomical observations, making a star catalog, defining the system of stellar magnitudes, and discovering precession from the apparent shift in the position of the north celestial pole. Astronomy 2016-10-13T00:00:00Z If you are in the Southern Hemisphere, answer this question for the south celestial pole, since the north celestial pole is not visible from your location. Astronomy 2016-10-13T00:00:00Z So Polaris, the star near the north celestial pole, has a declination of almost +90°. Astronomy 2016-10-13T00:00:00Z |
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