Age of Enlightenment Louis XV until the French Revolution. If taken back to the mid-17th century, the Enlightenment would trace its origins to Descartes' "Discourse on the Method", published in 1637. In France, many cited the publication of Isaac Newton's "Principia Mathematica" in 1687. It is argued by several historians and philosophers that the beginning of the Enlightenment is when Descartes shifted the epistemological basis from external authority to internal certainty by his "cogito ergo sum" published in 1637. As to its end, most scholars use the last years of the century, often choosing the French Revolution of 1789 or the beginning of
Cogito (software) on a Cogito managed repository. Conversely, most Cogito commands can be used on repositories primarily managed by Git or StGIT. Cogito is implemented as a set of Bash scripts (unlike Git, which is written mostly in C and portable Unix shell). As of April 2007 the project is stalled and declared "for sale", because a lot of the functionality has already been taken over by git, and the maintainer, Petr Baudiš, decided it would be better to focus on improving git-core. Cogito is released under the GNU GPL. As of May 2008, Cogito does not work well with recent Git