| If anybody wonders how could Galileo see Neptune (that was discovered, i.e. identified as a planet, only in 1846): he was actually observing Jupiter, but it happened that at the time Neptune was very close. If someone has an astronomical software and wants to see exactly what Galileo saw, enter Dec. 28, 1612 at 3.03 a.m. (universal time) in Florence. (A few days later, on Jan. 3, 1613, Jupiter even occulted Neptune, a very unusual phenomenon. Unfortunately both planets were below the horizon in Europe. The occultation could have been observed from China or Japan... if only someone had a telescope there). |