1. a bright spot appearing on a solar halo directly opposite the sun
Usage: meteorology; astronomy

Examples

• The anthelion appeared as a bright patch in the ice crystal halo.
• Photographers waited patiently to capture the rare anthelion phenomenon.
• The anthelion was visible for only a few minutes before the clouds moved in.
• Scientists studied the anthelion to better understand atmospheric optics.
• The mountain climbers were amazed to see an anthelion in the thin air above.