• Planets of the Solar System

    The planets of the Solar System revolve around the Sun, each with unique characteristics and orbit. They are divided into rocky planets (or inner) and jovian planets (or outer). The first (in order of proximity to the Sun we have Mercury, Venus, Earth and Mars) are relatively small and consist mainly…

  • Sun, a simple introduction to “our” star

    Sun is similar to all the other stars in the sky; it appears larger due to its proximity, about 150 million kilometers (compared to many billions of kilometers corresponding to different light-years of other stars). It’s therefore a privileged study object since it let us closely observe various phenomena. Energy…

  • Moon, the only natural satellite of Earth

    Moon, the only natural satellite of Earth, is easily visible with naked eye during day and night and it looks like when fully lit, as large as the Sun (size in the sky about 0.5°). Seen with binoculars or a telescope, it shows a surface covered by a multitude of…

  • Identify constellations and stars

    Identify constellations and stars is crucial to understand how to orientate in the Universe. One of methods is to observe particular stellar alignments: the main ones are Big Dipper and Orion constellation. Big Dipper, for observation places to above 40 ° latitude, is circumpolar ie is visible throughout the year….

  • Astronomy introduction

    An astronomy introduction for the benefit of those unfamiliar with the Universe: we face now themes are more familiar to amateur astronomers such as the nature of celestial objects, their names and recognition in firmament. In a pause to observe starry night sky from a place with little light pollution,…