Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
On February 3, 1848, he gave a public lecture about his ideas to 60 people at the New York Society Library.
Source: https://phys.org/news/2023-06-sky-dark-night-year-history.html