Solis is Latin for sun. Sol is the Roman equivalent of the Greek sun god Helios. And maybe in earlier times English-speakers did use these names. The Latin name for the Sun, Sol, is widely known but is not in common use. However, the adjectival form solar is used widely to refer to phenomena or attributes pertaining to the Sun.
The term Sol is also used by planetary astronomers to refer to the duration of a solar day on another planet, such as Mars. A mean Earth solar day is approximately 24 hours, whereas a mean Martian 'Sol' is 24 hours, 39 minutes, and 35.244 seconds.
You sometimes hear English-speakers use the name Sol for our Sun but, in English, in modern times, Sol is more a poetic name than an official one. You’ll never see Sol used by astronomers in their scientific writings, for example, unless they are writing in Spanish, Portuguese, or Swedish where Sol translates as Sun.
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