![]() ![]() Such associations are known a multiple star systems - binary systems being the most common with two stars. As many as six stars can be found orbiting one-another in close association. Measuring the position, distance and attributes of the stars is known as astrometry, and is a major part of observational astronomy. Stars have a variety of forms - different sizes, brightnesses, temperatures, and colours. Even though many stars have a much greater absolute magnitude than the Sun (the give out more light), they have an enormously smaller apparent magnitude due to their large distance. The Sun is just one of billions of stars. Never look at the Sun without using the proper filters! By far the safest way to observe the Sun it to look at it on a computer screen, courtesy of Stellarium! Stars WARNING: Looking at the Sun can permanently damage the eye. To toggle drawing of the ecliptic, press the 4 or, key. Stellarium can draw the ecliptic on the sky. Over the course of a year, the Sun appears to move round the celestial sphere in a great circle known as the ecliptic. ![]() The next nearest star, Proxima Centuri is approximately 260,000 times further away from us than the Sun! The Sun is also known as Sol, it's Latin name. The Sun is a star like many others but it is much closer to the Earth at approximately 150 million kilometres. The Sun is so bright that when it is in the sky, it's light is scattered by the atmosphere to such an extent that almost all other objects in the sky are rendered invisible. Without a doubt, the most prominent object in the sky is the Sun. 2.2 Optical Doubles & Optical Multiples.
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