German mathematician Johannes Kepler (1571-1630), revolutionised the Copernican heliocentric theory of the universe with his three laws of motion: that planets move not in circular but elliptical orbits, that their speed is greatest when nearest the sun, and that the sun and planets form an integrated system. This title contains two of his works.

*वर दाखवलेल्या स्कॅन केलेल्या प्रतिमा थेट स्टोअरमधून कॅप्चर केल्या आहेत.*