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Sinus Iridum

American  
[see-nuhs ir-i-duhm, sahy-] / ˈsi nəs ˈɪr ɪ dəm, ˈsaɪ- /

noun

  1. (Bay of Rainbows ) a semicircular dark plain in the second quadrant of the face of the moon.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The photograph captures Sinus Iridum - also known as the Bay of Rainbows - a massive crater 260km across.

From BBC • Sep. 12, 2024

"Shadow peaks of Sinus Iridum" by Gábor Balázs, from Hungary, took the top spot in the Our Moon category.

From BBC • Sep. 12, 2024

Moon shot Chang’e 3, China’s third lunar mission, will land on Sinus Iridum — the ‘Bay of Rainbows’ — China’s National Space Administration said on 29 October.

From Nature • Nov. 7, 2012

Along the whole shore of the bay runs a chain of gigantic mountains, forming the southern border of a wild and lofty plateau, called the Sinus Iridum Highlands.

From Astronomy with an Opera-glass A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments by Serviss, Garrett Putman

CARLINI.—A small but prominent and deep little crater about 5 miles in diameter on the Mare Imbrium about midway between Lambert and the Sinus Iridum.

From The Moon A Full Description and Map of its Principal Physical Features by Elger, Thomas Gwyn