A spectrometer.
From Wikipedia: "De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) is the seminal work on the heliocentric theory of the Renaissance astronomer Nicolaus Copernicus (1473-1543)."
The Moon is the heavenly body nearest to Earth.
Telescopes are the main instruments. There are many different types, such as radio telescopes, besides the "usual" optical telescopes. Other instruments such as spectrometers are very useful too.
Nicolaus Copernicus was the Polish scholar who published a heliocentric theory in his treatise 'On the Revolution of the Heavenly Spheres' in 1543. This theory proposed that the Sun, rather than the Earth, was the center of the universe, leading to significant changes in our understanding of the cosmos.
motion
Spectrograph.
An optical telescope is the simplest instrument to view the heavens.
telescope
Telescope.
Well, Depending on you question.: Either 1: The Photographer who works at PlayBoy Magazine. or 2: Astronomer. A man works looks at the stars and moons and planet in the universe.
Optical or radio telescope
Telescope or binoculars
Telescope or binoculars
Telescope or binoculars
Telescope or binoculars
It would be Nicholas Copernicus
Binoculars, cameras, the human eye, probes...