Definition of visual binary in English:
A binary star of which the components are sufficiently far apart to be resolved by an optical telescope.
- These were visual binaries - stars that could be resolved by eye using a good instrument.
- These spectroscopic binary stars are generally much closer to each other than visual binaries, as close as a few hundredths of an astronomical unit.
- Sirius is a visual binary, and with her two different eyes, it could be cool.
Definition of visual binary in:
- US English dictionary