n. A specialized kind of photography, comprised of concepts and techniques that pertain to the production of photographic images of astronomical objects.
the GNU version of the Collaborative International Dictionary of English
n. The application of photography to the delineation of the sun, moon, and stars.
The Century Dictionary and Cyclopedia
n. The application of photography to the delineation or record of solar spots, the moon's disk, the planets, and the constellations, and to other astronomical ends.
Word Usage
"We also went to see the open air astrophotography exhibition in St Andrews Square."