They were the first devised by Benjamin Franklin in 1784. The first eyeglass frame temples were made by Spanish craftsmen in 1600's. They affixed ribbons of silk or strings to the frame and loop them over the user's ears. The new types of eyeglasses carried out to China by Spanish and Italian missionaries.
The Asteroid Belt is located between the orbits of Mars and Jupiter: so it can only be one of the two planets that is the closest to it. Mars is located approx 250 million km from the Sun and Jupiter - 750 million km from the Sun. Mars is closer: so the correct answer is: Mars is the planet closest to the Asteroid belt.
Most known asteroids are found in the Main Belt between Mars and Jupiter, or in the Kuiper Belt past the orbit of Neptune. But there are thousands that orbit at least as close to the Sun as Earth.The vast majority of asteroids are smaller than 1 kilometer in diameter. The largest asteroid in the Main Belt is Ceres, which has been designated a dwarf planet. simple way which works for orbits with a small eccentricity, like most of the planets, is to find the maximum and minimum distance from the sun. If we call the distances Dma â¦ x and Dmin, the eccentricity is given by this formula: e = (Dmax-Dmin) / (Dmax + Dmin).