The discovery showed that the newly identified planet has a moon.
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Neptune is identified in Berlin 23 September 1846
Galle and d'Arrest found the predicted planet near a position calculated by Le Verrier.
A planetary prediction gets an observational test 23 September 1846
Perturbations in Uranus's orbit had led Le Verrier and independently Adams toward a possible unseen planet.
A star chart helps distinguish Neptune 23 September 1846
Comparing sky positions with a chart made the new planet identifiable during the observing session.
Collaboration and rivalry shape Neptune's discovery 23 September 1846
The dated observation in Berlin followed calculations developed in France and Britain.
Lassell discovers Triton 10 October 1846
William Lassell detected Neptune's largest moon seventeen days after the planet's discovery.
👉 Neptune gains its first known satellite Current 10 October 1846
The discovery showed that the newly identified planet has a moon.
Triton appears in an early Neptune search 10 October 1846
Lassell's telescope revealed a faint moving companion near the planet.
A distant moon broadens planetary astronomy 10 October 1846
Triton became the first known object orbiting Neptune.
Carrington witnesses a solar flare 1 September 1859
Carrington observed bright white patches near a sunspot during his regular solar observations.
Hodgson also reports the solar brightening 1 September 1859
Richard Hodgson independently observed the unusual white-light flare.
A flare enters the solar record 1 September 1859
The 1 September observations are among the first recorded sightings of a solar flare.