Astronomy

The Calendar

Since everyone has the impression that it is the Sun that revolves around the Earth, men use it to calculate the hours and measure the time that passes with clocks. This annual cycle was used by ancient civilizations, Egyptians, Mayans, Chinese or Greeks to create the first calendars. They were used mainly for agriculture, to …

Professional Astronomy

When you see the size of small astronomical instruments sold in specialty stores, they only impress novices. On the other hand, a telescope of 200 mm in diameter measuring between 1.5 and 2 m in height like the one presented above on the left intimidates already an amateur informed by its proportions and the quality …