Carrington witnesses a solar flare

The dated observation in Berlin followed calculations developed in France and Britain.

William Lassell detected Neptune's largest moon seventeen days after the planet's discovery.

The discovery showed that the newly identified planet has a moon.

Lassell's telescope revealed a faint moving companion near the planet.

Triton became the first known object orbiting Neptune.

Richard Hodgson independently observed the unusual white-light flare.

The 1 September observations are among the first recorded sightings of a solar flare.

A powerful geomagnetic storm followed; the sequence later helped develop the study of space weather.

The UTC catalog fixes the transit on 9 December, giving astronomers another rare timing opportunity.

Observing campaigns used cameras as well as telescopes to document Venus crossing the Sun.