What's the difference between astronomy and cometology?

Astronomy

Definition:

(n.) Astrology.
(n.) The science which treats of the celestial bodies, of their magnitudes, motions, distances, periods of revolution, eclipses, constitution, physical condition, and of the causes of their various phenomena.
(n.) A treatise on, or text-book of, the science.

Example Sentences:

(1) Since 1930 Dr. Rakowiecki has started as self-taught astronomy studies becoming soon one of seven most eminent Polish astronomers.
(2) "When I was a boy, I was doing both music and science: I belonged to an astronomy club, we built telescopes, we looked at the stars.
(3) Over a crest in the road was the cause of the electronic silence: the National Radio Astronomy Observatory (NRAO), an array of radio telescopes set against the indigo vastness of the Blue Ridge Mountains.
(4) His scientific achievements based on higher mathematics included 20 important reports on astronomy and several monographs on mathematics.
(5) That robs astronomy of one of its key recruiting tools: the chance to plant young scientists under the dish and let its hum capture their imagination.
(6) September 16, 2015 The White House said Ahmed was invited to participate in an astronomy night next month.
(7) Ekers said the scholarship was put in place “to remedy this increasing gap where astronomy departments are not teaching people to build telescopes”.
(8) Thejll's study has been accepted for publication in the journal Astronomy and Astrophysics.
(9) And I think also something like the recent Star Gazing Live on BBC2, the astronomy show stretched nightly across a single week, was an example of great, creative commissioning, where time and space, literally, was entrusted to a group of individuals and experts, at a risk it could all fall flat, but given encouragement and profile – and in the garnering, great viewing figures and rewards.
(10) Rameau reminded his readers that mathematics is as important in music as it is in astronomy, and saw no conflict between the charts and formulae that fill his treatise and his ravishing operas and instrumental music.
(11) "If we don't continue to encourage people who understand the technology as well as the astronomy, it's going to be very hard to move forward in the future,” he said.
(12) A senior scientist within the CSIRO’s astronomy division, Dr Bärbel Koribalski, said the suspension of the Bolton Fellowship and the looming staff cuts had put “a dampener on our motivation and spirit, and they come as a big surprise overall”.
(13) At last it’s summer, that precious season in the academic calendar when the days start early and end late because of astronomy and not the demands of the job.
(14) Scientists from fields as diverse as neuroscience, astronomy, robotics, immunology, particle physics, sustainable agriculture, molecular biology, nanotechnology, cancer and photon therapy say a “Brexit” would lead to funding cuts , make recruiting and retaining top academic talent harder, and – crucially – cripple the cross-border collaboration on which research thrives.
(15) Feain said the fellowship was “bringing in very good people, we’ve had some excellent international Boltons, and in the astronomy world, it’s recognised all around the world”.
(16) A childhood ambition to be an astronaut led to a degree in astronomy but he dropped out (“far more theoretical than I had expected”) returning to complete a 2:2 in economics at University College, London.
(17) They give us a glimpse of the impressive knowledge of pre-Columbian mathematics and astronomy.
(18) Mayer's achievements in the fields of mathematics, physics, astronomy and cartography were recently summarized by the extensive historical research of G.F. Forbes.
(19) These outposts of Neolithic astronomy, although impressive, were nevertheless peripheral, says Richards.
(20) In between winning three Oscars , having four children, keeping bees and studying music, Murch recently investigated new links between the architecture of the Pantheon, the work of Copernicus and the origins of heliocentrism in western astronomy.