There are several such tests, but all have dots of precisely equal brightness.

The distance of one of the lamps was adjusted until the two were judged to give equal brightness.

A rough moon reflects in all directions equally, leading to a disk of approximately equal brightness which is what is observed.

In pairs where the two stars are of equal brightness, they are also of the same spectral type.

Quasars are about the size of our solar system but have a brightness equal to 100 galaxies or more.

The five bursts were of equal brightness, with each lasting about 10 minutes, and occurring every 77 minutes.

Pure, saturated hues of equal brightness are located around the equator at the periphery of the color sphere.

It is in Rome's interests to hope that both of us shine with equal brightness, is it not?

Sun and moon are astrologically believed to be at their most exalted equal brightness on this day.

The two stars are of nearly equal brightness, with visual magnitudes of 12.57 and 11.99 as seen from Earth.