Johanne Bode was born on January 19, 1747. In 1772 he advanced a mathematical theory which suggested the presence of additional planets, beyond the seven that were known of at that time. Start at zero, then skip to 3, then 6, and now keep on doubling the number. Then add 4 to each of those numbers and finally, divide by ten, giving you .4, .7, 1, 1.6, 2.4, 4.8, and 9.6. Those are roughly the spacings between the planets, expressed as astronomical units, the average earth-sun distance. This theory, called Bode’s Law, is quasi-scientific. It doesn’t work every time, and it’s not particularly exact, but it did point to a gap between the orbits of Mars and Jupiter. Astronomers began the search for the proposed missing planet, and on January 1st, 1801, the Sicilian astronomer Father Giuseppe Piazzi used a telescope to discover 500 mile-wide Ceres, the largest rock in the asteroid belt.