from where did the latter term derive?
Astron means star and nomia means law,
Astronomy
Astronomy" (from the Greek ἀστρονομία from ἄστρον "astron", "star" and -νομία "-nomia" from νόμος "nomos", "law" or "culture") means "law of the stars" (or "culture of the stars" depending on the translation).
what does noble gas mean? Odorless, colorless, monatomic gases with very low chemical reactivity. who discovered the first nobel gas? Pierre Janssen and Joseph Norman Lockyer and which was it? Helium who is the former by profession? A French astronomer what kind of work does the astronomers do? They observe astronomical objects such as stars, planets, moons, comets and galaxies who are the amateurs in this profession? Some devote a few hours a month to stargazing and reading the latest developments in research, others assist professional astronomers in research. what academic background does it need? PhD in physics or astronomy
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Astronomy [SEP] Etymology
"Astronomy" (from the Greek ἀστρονομία from ἄστρον "astron", "star" and -νομία "-nomia" from νόμος "nomos", "law" or "culture") means "law of the stars" (or "culture of the stars" depending on the translation). Astronomy should not be confused with astrology, the belief system which claims that human affairs are correlated with the positions of celestial objects. Although the two fields share a common origin, they are now entirely distinct.