astronomical
adjective
as·tro·nom·i·cal
ˌa-strə-ˈnä-mi-kəl 
variants
or less commonly astronomic
1
: of or relating to astronomy
astronomical observations
2
: enormously or inconceivably large or great
astronomical numbers
an astronomical price
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
The Farmers’ Almanac uses a proprietary astronomical and mathematical formula that dates back to 1818, which looks at things like planet positions, the moon location, as well as sunspot activity for the basis of its long-range outlooks.
—
Kansas City Star, 16 Aug. 2025
Sardinia’s connection to the healing power of seawater dates back to the island’s Nuragic civilization of 1800 BC, which practiced water rituals aligned with lunar and astronomical cycles.
—Alexandra Kirkman, Forbes.com, 15 Aug. 2025
As a major astronomical research facility, the CTIO hosts nearly 40 telescopes at it site, which offers exceptionally clear dark skies to peer deep into space.
—Kenna Hughes-Castleberry, Space.com, 15 Aug. 2025
The winter solstice is the start of astronomical winter, when Earth's northern hemisphere is pointed the farthest away from the sun due to its tilted axis.
—Sarah Moore, Freep.com, 12 Aug. 2025
See All Example Sentences for astronomical
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Kansas City Star, 16 Aug. 2025
Sardinia’s connection to the healing power of seawater dates back to the island’s Nuragic civilization of 1800 BC, which practiced water rituals aligned with lunar and astronomical cycles.
—Alexandra Kirkman, Forbes.com, 15 Aug. 2025
As a major astronomical research facility, the CTIO hosts nearly 40 telescopes at it site, which offers exceptionally clear dark skies to peer deep into space.
—Kenna Hughes-Castleberry, Space.com, 15 Aug. 2025
The winter solstice is the start of astronomical winter, when Earth's northern hemisphere is pointed the farthest away from the sun due to its tilted axis.
—Sarah Moore, Freep.com, 12 Aug. 2025
See All Example Sentences for astronomical
Cite this Entry
“Astronomical.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astronomical. Accessed 23 Aug. 2025.
Copy CitationKids Definition
astronomical
adjective
as·tro·nom·i·cal
ˌas-trə-ˈnäm-i-kəl
variants
also astronomic
1
: of or relating to astronomy
2
: extremely or unbelievably large
the cost was astronomical
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