"Equation of time", 18th century manuscript containing a table for every day of the year, together with a page of explanatory notes, 33 pages with notes on notions of geography, astronomy, nautical, astrology and climate, presented in the form of dialogue between two characters, 8 tables with "The true place in the Zodiac" and 8 pages "of the declination of the Sun to the Leap year" and for the three following Leap years. A fully parchment binding of the time, a little bit neglectful.