Johann Galle · Asteria Star

Biography

Johann Galle was the astronomer at the Berlin Observatory who, on 23 September 1846, pointed his telescope where Urbain Le Verrier's calculations predicted and found Neptune almost at once. With his student Heinrich d'Arrest he turned a mathematical prediction into the discovery of a new planet.

Scientific contributions

First to observe the planet Neptune (1846)
Confirmed Le Verrier's prediction within a degree

Major discoveries

The Prediction and Discovery of Neptune1846 CE

Observatories, instruments & objects

Observed

Neptune

Knowledge connections

Part ofModern Astronomy
ObservedNeptune
First observedThe Prediction and Discovery of Neptune

Sources & references

Facts on this topic will be cited from these primary and reference sources.

BritannicaEncyclopaedia Britannica
General reference for the history of astronomy, biographies, and cultural context.
IAUInternational Astronomical Union
Official naming, definitions, constellation boundaries, and astronomical nomenclature.

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