Year
In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year.
Decimal time
In 1754, Jean le Rond d'Alembert wrote in the "Encyclopédie":
In 1788, Claude Boniface Collignon proposed dividing the day into 10 hours or 1000 minutes, each new hour into 100 minutes, each new minute into 1000 seconds, and each new second into 1000 "tierces" (Latin for "third"). The distance the twilight zone travels in one such "tierce" at the equator, which would be one-billionth of the circumference of the earth, would be a new unit of length, provisionally called a half-handbreadth, equal to four modern centimetres. Further, the new "tierce" would be divided into 1000 "quatierces", which he called "microscopic points of time". He also suggested a week of 10 days and dividing the year into 10 "solar months".