Titius-Bode Law -. Mercury 0.4 AU’s Venus + 0.3 (0.7) Earth + 0.6(1.0) Mars+ 1.2(1.6) A. B.+ 2.4(2.8) Jupiter+ 4.8(5.2) Saturn+ 9.6(10.0) Uranus+19.2(19.6) (Actually 19.2) Neptune+38.4(38.8) (Actually 30) Plutois at 39.5.
The Titius-Bode law works very well for the first six planets and the asteroid belt, but not very well for the planets after that. The Titius-Bode law is probably just a curious coincidence.
Mercury’s orbit is always within 0.5 AU of the Sun. It is always visually close to the Sun; therefore, it is only observed when low on the horizon (or during a solar eclipse).
Mercury was originally thought to be two planets. The Greeks called it Apollo when seen in the morning and Hermes when seen in the evening.
Mercury’s albedo is only about 0.1, similar to Earth’s Moon.However, Mercury’s nearness to the Sun makes it one of the brightest objects in the night sky.