lacus solis
C2 (Extremely Rare / Technical)Scientific, historical astronomy, poetic.
Definition
Meaning
A large, dark basaltic plain on the surface of the Moon, historically mistaken for a lake.
A specific lunar mare (sea) located on the Moon's near side. In broader astronomical or poetic context, can refer to any sun-related lake or metaphorical place of solar origin.
Linguistics
Semantic Notes
"Lacus Solis" is a Latin term meaning "Lake of the Sun." It is not a modern standard IAU (International Astronomical Union) lunar feature name but appears in historical lunar cartography (e.g., by Giovanni Riccioli). It corresponds approximately to the Mare Nubium region.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage. Both use the Latin term identically in technical contexts.
Connotations
Evokes historical astronomy, classical scholarship, and poetic imagery.
Frequency
Virtually never used in everyday language. Equally rare in both UK and US specialized texts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Lacus Solis] + [verb: is located/ appears/ was charted] + [prepositional phrase]The [feature/ mare] + [known as/called] + [Lacus Solis]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None in common usage.”
Usage
Context Usage
Business
Not used.
Academic
Used in historical papers on astronomy or the history of science.
Everyday
Not used.
Technical
Used in specialized contexts discussing pre-20th century lunar nomenclature.
Examples
By Part of Speech
verb
British English
- The feature was once labelled 'Lacus Solis' on lunar maps.
- Early astronomers misidentified and named it Lacus Solis.
American English
- Riccioli charted and designated the area Lacus Solis.
- You can locate Lacus Solis on that 17th-century engraving.
adverb
British English
- Not applicable (no adverbial use).
American English
- Not applicable (no adverbial use).
adjective
British English
- The Lacus Solis region appears darker through the telescope.
- He studied the Lacus Solis coordinates.
American English
- A Lacus Solis reference appears in the old text.
- The map shows the Lacus Solis feature clearly.
Examples
By CEFR Level
- Lacus Solis is an old name for a dark area on the Moon.
- Some old maps of the Moon show Lacus Solis.
- The historical lunar feature Lacus Solis, or 'Lake of the Sun,' corresponds to part of the Mare Nubium.
- In his 1651 work, Riccioli included Lacus Solis among his nomenclature for lunar 'lakes.'
Learning
Memory Aids
Mnemonic
Think: 'SOL' is the Sun, and a LAKE (lacus) on the moon named after it. 'The Sun's Lake on the Moon.'
Conceptual Metaphor
THE MOON'S SURFACE IS A MAP WITH TERRESTRIAL FEATURES (seas, lakes).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate as "солнечное озеро" in a modern lunar context; it is a proper name. Use the Latin term or explain as "историческое название лунного моря."
- Avoid confusing with Russian "море" (more) for lunar mare; Lacus Solis is a specific historical 'lake'.
Common Mistakes
- Using it as a current astronomical term. / Pronouncing 'Solis' with a hard 's' (should be /s/). / Treating it as an English compound noun (e.g., 'the Lacus Solis').
Practice
Quiz
What is 'Lacus Solis' primarily associated with?
FAQ
Frequently Asked Questions
No. It is a historical name for a dark, dry plain on the Moon mistaken for a lake by early astronomers.
Only in a historical context. The modern standardized name for the region is Mare Nubium (Sea of Clouds).
It is Latin for 'Lake of the Sun.'
It is an example of the historical practice of naming lunar features after earthly bodies of water, contributing to the history of science.