There are many Johann gottfrieds
Neptune
Johann Gottfried Galle (June 9, 1812 - July 10, 1910) was a German astronomer at the Berlin Observatory who, with the assistance of student Heinrich Louis d'Arrest, was the first person to view the planet Neptune, and know what he was looking at (September 23, 1846). He used the calculations of Urbain Le Verrier to know where to look.
Astronomers noted that Uranus was not quite following the orbit predicted fro it. They hypothesized that the gravity of an unseen planet was affecting Uranus's orbit.
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Neptune was predicted by astronomers be observing the effects of its gravity. Neptune was discovered in 1846 by Johann Gottfried Galle.
Johann Gottfried Galle
Johann Gottfried Wetzstein died in 1905.
Johann Gottfried Zinn was born in 1727.
Johann Gottfried Roesner was born in 1658.
Johann Gottfried Langermann was born in 1768.
Johann Gottfried Stallbaum died in 1861.
Johann Gottfried Scheibel died in 1843.
Johann Gottfried Scheibel was born in 1783.
Johann Gottfried Wetzstein was born in 1815.
Johann Gottfried Büring died in 1788.
Johann Gottfried Büring was born in 1723.
Johann Gottfried Schadow died in 1850.
Johann Gottfried Schadow was born in 1764.