< /ˈyoʊ hɑn/, 1571–1630, German astronomer.

  • a crater in the second quadrant of the face of the moon having an extensive ray system: about 22 miles (35 km) in diameter.
  • noun

    1. Johannes (joˈhanəs). 1571–1630, German astronomer. As discoverer of Kepler’s laws of planetary motion he is regarded as one of the founders of modern astronomy


    1. a small crater in the NW quadrant of the moon, centre of a large bright ray system

    1. German astronomer and mathematician who is considered the founder of celestial mechanics. He was first to accurately describe the elliptical orbits of Earth and the planets around the Sun and demonstrated that planets move fastest when they are closest to the Sun. He also established that a planet’s distance from the Sun can be calculated if its period of revolution is known.
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