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Around the world, about thirty observatories have dedicated at least one telescope to the study of the Sun. Given the atmospheric turbulence, it is almost impossible to use instruments over…

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Since the manufacture of the 5 m diameter mirror of the Mount Palomar Observatory in 1939, because of their gross mass exceeding 40 tons, the mirrors of the large telescopes…

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At the turn of the twentieth century, Lorentz understood the futility of mechanical support to explain the propagation of the electromagnetic field. He also discovered the theory of electrons. Meanwhile,…

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A decisive step was taken in the seventeenth century by Johannus Kepler in Germany, a renowned mathematician, the founding father of modern astronomy. Protestant of confession and thus little concerned…

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In China, the greatest astronomer of the Middle Kingdom was Tcheou Kong, the brother of Emperor Wou Wang who lived in the eleventh century before our era. He built an…

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