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Astronomy - Essay Example

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The effect of Rayleigh scattering causes the light of the sky to have a definite pattern of polarization hence the blue color through the elastic scattering. This effect is…
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ASTRONOMY ASTRONOMY THE SKY MODEL FROM THE SAME SPOT TO THE NEAREST INCH Source: Suhai, B.; Horváth, G. (2004).How well does the Rayleigh Sky Model describe the E-vector distribution of Skylight in clear and cloudy conditions.
According to the Rayleigh sky model the daytime pattern of the sky is described in a polarized set up. The effect of Rayleigh scattering causes the light of the sky to have a definite pattern of polarization hence the blue color through the elastic scattering. This effect is mainly attributed to the scattering of light from water, aerosols, water and light from water molecules. At each wavelength the polarization is determined by the degree of polarization and orientation also known as the scattering angle or the e-vector angle.
FINDING CARDINAL POINTS
The sunset appears to move alone the horizon from the beginning to the end of the semester towards the meridian cardinal also known as the True North. Yes, this makes sense because its authenticity can be determined by the high degree of accuracy with the use simple methods adopted since time in memorial. With the help of modern technologies like the Magnetic compass or Polaris (Northern star) the cardinal point will easily be identified.
http://physics.weber.edu/schroeder/ua/StarMotion.html
The main purpose of this site is to help people understand the Whole set up of Astronomy. It begins by focusing on the motion of the stars. These are artificial and fascinating natural objects that continue to illuminate light in the universe. As a result many people all over the universe have been wondering what these stars, how far and their arrangement in the sky.
These intimate questions have led to emergency of Astronomists who can help people try to understand what is happening in the universe. Unlike the ancient people who intimately familiarized themselves with night sky the modern people do not have that time thus the need for assistance from the specialists in sky matters. It is also important to note that the as the stay stars move in the sky they maintain the same pattern hence prompting the specialists come up with constellations. As far as astronomy is concerned there are only 88 official constellations recognized by the astronomers. In order for one to carefully understand this arrangement the study of sky motion applet comes in handy.
The distance between the two points in the sky can only be estimated by measuring of angles. This is done by measuring the two imaginary lines that are always seen running from the eyes and the two points.
In order to understand the motion of the sky the ancient people had to come up with a mechanical model that would aid in clarifying this movement. The logic behind this is that all stars are entangled on a huge rigid celestial sphere that engulfs the earth and rotates around after every 23 hours and 56 minutes. It is understood that this rotation compels the stars to move in their circular path. The main reason why the constellations never change is because of the rigidity of the sphere. As a result several locations in the sky are named: north celestial pole which is the fixed point in the northern sky and located only a few degrees from the North Star, there is a celestial equator that is ninety degrees from the pole. The last great circle is the meridian which is perceived to run from the north to the south. This is straight, overhead and remains fixed in the sky as the sphere continues moving. The straight point overhead is known as the Zenith.
REFERENCE
Suhai, B, Horvath, G,(2004). How well does the Rayleigh Sky Model describe the E-vector distribution of Skylight in clear and cloudy conditions? London: Cambridge University Press,pp 10 -85. Read More
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