This Trek — Metaphysics For Your Journey

By admin 　http://www.thistrek.com/crystal-sphere/

Novice amateur astronomers and anyone with more than one step in the night sky are often confused by the positions of the stars that seem to change, not only during one night, but during a year. To add to the confusion, the graphics printed stars often show the sky as a circle, and also relate to cardinal points. The "celestial sphere" is an aid to overcome this confusion.

A celestial sphere the idea is not new. Our ancestors believed at the beginning of the earth was the center of the universe and the stars and other celestial points of light were connected to a large glass sphere, with Earth at its center, the alternation of the stars move from east to west during the night. In our enlightened age who mock the idea, but still very useful in the night sky. In fact, pie charts that the star is so confused neophyte, can be viewed as maps of the celestial sphere view of half the Earth at different times of year, from different latitudes.

To understand the concept of the celestial sphere, try to view an imaginary straight line that passes through the land north and south poles and is infinite in each end. Now, put in position and distance ancestors imagined that the stars are in fact attributable to a large area surrounding the field. Then, the north celestial pole is located at the point where the imaginary line that runs from the north pole of the earth and through the sky, the celestial South Pole, is on the opposite side. In other words, the celestial north and south poles are located directly above the earth north and south poles and the celestial equator lies directly above the equator.

Without However, you know – but their ancestors did not know – that the earth rotates on its polar axis from west to east, once in 24 hours. The effect of this, the celestial sphere appears to rotate around its axis from west to east, once in 24 hours, causing the sun, stars and other objects to rise in the east and west. The form of these movements depends on where you are located on the surface of the earth. To a person standing on land, ecuador, celestial poles are on the horizon to the north and south, and the whole sky appears to move slowly from east to west, near the celestial pole star after radio arc smaller than those of stars near the celestial equator, stars near the celestial equator appears to be increasing due to the east and generally follow a path towards the west.

Moreover, for a person standing on one of the poles, the horizon line with the celestial equator, and it seems that half the sky, ie the part above the horizon, turning on the pole – clockwise in the north pole, and clockwise to the South Pole. Elsewhere in the poles or the equator, the perception of motion of the sky depends on the latitude of the observer, and one of the celestial poles are above the skyline. The height of the pole in degrees is the latitude observers. For example, suppose you stand in one place in the southern hemisphere at a latitude of 30 degrees south. Then, the south celestial pole is 30 degrees on the southern horizon. At the same time, the celestial north pole, would be 30 degrees below the northern horizon, so there are stars that never From their point of view south. Of course, the same would apply if you have found yourself in the northern hemisphere.

Another important point that should be mentioned, is the apparent shift in positions of stars during the year. A person who is familiar with the night sky from any star that appears to an increase of about four minutes earlier each night, seen from a location on Earth. The explanation for this lies in the fact that, in addition to the Earth's rotation on its axis, which revolves around the sun. This movement changes in our point of view on the merits stars. I wonder how our distant ancestors to explain in terms of a celestial sphere …

Chris de Villiers
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