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It is in the 1700's if they say in the 18th century.
The philosophical atmosphere of the 18th century
Rococo
The 18th-Century (Age of Enlightenment)
In the 18th and 19th Century. It is called the Age of Enlightenment or Age of Reason.
The Enlightenment or the Age of Reason: The enlightenment was a philosophic movement of the 18th century marked by a rejection of traditional social, religious, and political ideas and an emphasis on rationalism.
The Age of Enlightenment (or simply the Enlightenment) is the era in Western philosophy, intellectual, scientific and cultural life, centered upon the 18th century, in which reason was advocated as the primary source for legitimacy and authority.
The Enlightenment, also known as the Age of Enlightenment and the Age of Reason, during the mid-18th to late-18th century.
The Age of Enlightenment began around the 18th century. It was the cultural movement of intellectuals that emphasized individualism and reason rather than tradition.
The Age of Enlightenment (or simply the Enlightenment) is the era in Western philosophy, intellectual, scientific and cultural life, centered upon the 18th century, in which reason was advocated as the primary source for legitimacy and authority
From beginning of the 18th century till the French Revolution of 1789 or the beginning of the Napoleonic Wars (1804-15).
The Age of Enlightenment, which was during the 18th century when science started to change people's views and what they believed in.