An instrument for measuring the intensity of sunlight.
A heliogram.
A device for photographing the sun.
An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
To send a message by heliograph.
To send a heliograph.
A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces
A type of system using such a method, differentiated by platform, configuration, frequency, power, and other technical attributes.
An installation of such a system or of the transmitting and receiving apparatus.
A superior ability to detect something.
To scan with radar, or as if with radar.