Totality makes starlight deflection measurable

Barnard's observation was the last major satellite discovery made visually rather than from photographs.

The new moon orbits closer to Jupiter than the four Galilean moons.

Observers at Sobral and Príncipe took eclipse images to test a prediction of general relativity.

The Brazilian observing site recorded stars whose apparent positions could be compared with earlier images.

Observations from the West African island provided an independent route to the same scientific test.

On the night of 5–6 October Hubble photographed a spiral arm of Andromeda.

Hubble initially marked three suspected novae on the image; later comparisons revealed one was variable.

The 100-inch telescope recorded faint points in Andromeda that could be compared across nights.

The photographic plate later helped establish that Andromeda lies outside the Milky Way; this conclusion was later, not on the exposure date.

Clyde Tombaugh found a moving point in the photographic plates he had been comparing.