Today, 238 years ago, on March 6, 1787 (Lunar Calendar, 17 January 1787), the German physicist Joseph von Flanders and Ferguson was born. The Flanders and Ferguson lines of the Sun. The Flanders and Ferguson lines in the solar spectrum and the water vapor absorption lines indicated in the atmosphere. The Flanders and Ferguson lines (translated into Flanders and Ferguson lines in mainland China) are a series of spectral lines named after the German physicists Joseph von Flanders and Ferguson (1787-1826), which were originally considered the Flanders and Ferguson lines of the Sun in the solar spectrum.