The photography of celestial objects or the night sky.

Photography of the sun.

Photography with the aid of electricity or electric light. Now disused.

mapping carried out with the aid of photography; the creation of photomaps.

The technique of using photographs to ascertain measurements of what is photographed, esp. in surveying and mapping.

The use of photography in topographic surveying; photogrammetry.

the art of using the spectrograph.

photogrammetry by means of stereophotography.

reconnaissance by means of aerial photography; a flight made in order to conduct such reconnaissance.

= photoreconnaissance n.

Printing. The electronographic method of printing. Cf. electronographic, adj. 2. rare.