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Observing the night sky.

As we all know, nothing stays still in space: the planets move around his star, the star turns around its galaxies, the galaxies go away from the initial Big Bang's point... What happens is that the other stars are so far away from us that their movements are practically imperceptible. Therefore, the constellations we see today are almost identical to those that should have seen the cavemen. Wonderful starry night for observation.

To observe the night sky, we are goin to "forget" the continuing motion state of the universe and we can imagine that the Earth is surrounded by a rigid sphere, the sky, whose center of rotation is the same as the Earth have. In this way we can put, on that imaginary sphere, different objects that fill the sky and can set a coordinate system using the celestial equator of this hypothetical rigid sphere as a reference plane.

The constellations, that serve us as guides or benchmarks in this celestial sphere, in fact lack from the imaginary form that we give them, as the stars that compose it are not at the same distance from Earth. The name of the constellation is given by the figure apparently represented when we see it from our planet. Obviously, from another observation point of the universe, the appearance of these constellations would be very different.

Another important point for stellar observation is its apparent magnitude (already explained when we talk about stars). To this point there are a multitude of stars guides in bookstores.

One of the most rewarding ways to observe the sky is carrying a observations record. A notebook will help us in this task. We must write down the date, time expressed in Universal Time (UT), which is the Greenwich Meridian (GMT), magnification and opening of the telescope in use, visibility conditions, and if we feel it appropriate, we will make at the moment drawings of what we find interesting.

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