as·​tro·​nom·​i·​cal ˌa-strə-ˈnä-mi-kəl How to pronounce astronomical (audio)
variants or less commonly astronomic
: of or relating to astronomy
astronomical observations
: enormously or inconceivably large or great
astronomical numbers
an astronomical price
astronomically adverb

Examples of astronomical in a Sentence

The cost of the office building was astronomical. We got an astronomical telephone bill this month.
Recent Examples on the Web Rather than being spread across the star’s surface as predicted by astronomical theory, the metal was focused in one area, said study coauthor John Landstreet, professor emeritus of physics and astronomy at Western University in Canada, in a statement. Ashley Strickland, CNN, 26 Feb. 2024 Like in 2017, tourists living in partial eclipse areas will travel en masse to cities on the path of totality to fully experience this uncommon astronomical event. Claire Reid, Journal Sentinel, 26 Feb. 2024 These astronomical issues are ones that each of us struggle with on a day-to-day basis. Bruce Dorminey, Forbes, 25 Feb. 2024 Today’s astronomers use sophisticated mathematical models known as astronomical ephemerides. Elissaveta M. Brandon, WIRED, 24 Feb. 2024 As such, it is only recommended for experienced astronomical observers, according to the American Astronomical Society. Eric Lagatta, USA TODAY, 24 Feb. 2024 Full moons boast astronomical meaning in the cosmic world. Skyler Caruso, Peoplemag, 14 Feb. 2024 So those who fancy curiosities and coincidences, astronomical, meteorological and arithmetical, may recognize the importance and pivotal nature of Friday. Martin Weil, Washington Post, 10 Feb. 2024 Origins of the lunar calendar Traditionally, the Chinese have followed their native lunar calendar, which is based on observations and measurements of astronomical phenomena. Mario Poceski, The Conversation, 5 Feb. 2024 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'astronomical.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Late Latin astronomicus "of or relating to astronomy" (borrowed from Greek astronomikós "of astronomy, skilled in astronomy," from astronomía astronomy + -ikos -ic entry 1) + -al entry 1

First Known Use

1551, in the meaning defined at sense 1

Time Traveler
The first known use of astronomical was in 1551

Dictionary Entries Near astronomical

Cite this Entry

“Astronomical.” Dictionary, Merriam-Webster, Accessed 1 Mar. 2024.

Kids Definition


as·​tro·​nom·​i·​cal ˌas-trə-ˈnäm-i-kəl How to pronounce astronomical (audio)
variants also astronomic
: of or relating to astronomy
: extremely or unbelievably large
the cost was astronomical
astronomically adverb

More from Merriam-Webster on astronomical

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