of, relating to, or connected with .
extremely large; exceedingly great; enormous:
It takes an astronomical amount of money to build a car factory.
Contemporary Examples

And the investments required to make the system functional are astronomical.
CapeFlyer Train From Boston to Cape Cod Is Overnight Success Kelsey Meany July 15, 2013

The year-round central AC bills are astronomical, not to mention the impact on the environment.
Battle of the Twilight Heartthrobs The Daily Beast June 22, 2010

Soldera continued to keep tongues wagging when he announced an astronomical price hike for his 2006 Vintage, from $300 to $600.
Brunello’s King Lear: Gianfranco Soldera Reflects on the Attack on His Wine Alice Feiring December 7, 2013

No amount of money could meet his demands, making the damages for his suit “priceless”—hence the astronomical sum.
Anton Purisima Files the Largest Lawsuit Ever Over a Rabid Dog, and It Could Bankrupt the World Tim Teeman May 18, 2014

Close to 19 million people tuned in last season, an astronomical number for cable TV.
The ‘Property Brothers’ Are Reality Television’s Crack Cocaine Itay Hod September 7, 2013

Historical Examples

The history of the 18th-century Borghesi astronomical clock is described here from contemporary source material.
Smithsonian Institution – United States National Museum – Bulletin 240 Anonymous

And yet such is the true character of the astronomical Sermons of Chalmers.
Leading Articles on Various Subjects Hugh Miller

It was the second astronomical book to be printed, the first edition appearing at Ferrara in 1472.
The gradual acceptance of the Copernican theory of the universe Dorothy Stimson

In that case we are driven back upon the astronomical method.
Clairvoyance Charles Webster Leadbeater

The last invention bore fruit in astronomical discoveries, and in 1610 he discovered four of the moons of Jupiter.
The World’s Greatest Books – Volume 15 – Science Various

enormously large; immense
of or relating to astronomy

1550s, from astronomy + -ical. Popular meaning “immense, concerning very large figures” (as sizes and distances in astronomy) is attested from 1899. Astronomical unit (abbreviation A.U.) “mean distance from Earth to Sun,” used as a unit of measure of distance in space, is from 1909. Related: Astronomically.


Inconceivably large: an astronomical price for that car

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  • Astronomical clock

    a clock indicating or representing the movements of the sun or planets, the phases of the moon, or the sky visible at a given time, used as a means of establishing time or for additional information, as locating celestial bodies or timing their movement. a clock used for observing the apparent time of the meridian […]

  • Astronomical distance

    the distance from one celestial body to another, measured in astronomical units, light-years, or parsecs.

  • Astronomical frame of reference

    a frame of reference in which the sun or center of mass of the universe is fixed and which does not rotate with respect to the fixed stars.

  • Astronomical refraction

    (def 3).

  • Astronomical telescope

    a telescope having an objective with a long focal length and an eyepiece with a short focal length, usually used for observing celestial bodies. Historical Examples Kepler, in 1611, made the first astronomical telescope with two concave glasses. Astronomical Myths John F. Blake One word about the inversion of objects by the astronomical telescope. Half-hours […]

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