noun
- An optical instrument that blocks the bright light of the sun's disk to allow observation of the sun's corona and nearby celestial objects.
Usage: astronomy; also spelled coronagraph
Examples
- Astronomers use a coronograph to study the sun's corona during a solar eclipse.
- The space telescope is equipped with a coronograph to detect faint objects near bright stars.
- A coronograph blocks direct sunlight so researchers can observe the solar atmosphere.
- The coronograph revealed new details about the sun's outer layers.
- Modern coronographs have improved the detection of exoplanets around distant stars.