A _Month_ is properly a certain space of time measured by the Moon in his course round the Earth. A _Lunar Month_ is either _Periodical_ or _Synodical_. A _Periodical Month_ is that space of time the Moon takes to perform her course from one point in the ecliptic ’till she arrives to the same again, which is 27 days, and some odd hours; and a _Synodical Month_ is the time betwixt one new Moon, and the next new Moon, which is commonly about 29½ days. But a _Civil Month_, is different from these, and consists of a certain number of days, fewer or more, according to the laws and customs of the country where they are observed. [Sidenote: A _Year Sydereal_ and _Tropical_.] The compleatest period of time is a _Year_, in which all the variety of seasons return, and afterwards begin anew. A _Year_ is either _Astronomical_ or _Civil_. An _Astronomical Year_ is either a _Sydereal_ wherein the Sun departing from a fixed Star, returns to it again; or _Tropical_, which is the space of time the Sun takes to perform his course from any point of the ecliptic, ’till he returns to it again. A _Tropical Year_ consists of 365 days, 5 hours, and 49 minutes; this is the time in which all the seasons compleatly returns, which is a small matter less than a Sydereal Year. [Sidenote: _Egyptian Year._] The _Civil Year_ is the same with the _Political_ established with the laws of a country; and is either moveable or immoveable. The moveable year consists of 365 days, being less than the tropical year by almost six hours, and is called the _Egyptian Year_, because observed in that Country. The _Romans_ divided the year into 12 kalendar months, to which they gave particular names, and are still retained by most of the _European_ nations, _viz. January_, _February_, _March_, _April_, _May_, _June_, _July_, _August_, _September_, _October_, _November_, and _December_. The number of days in each month may be known by the following verses: _Thirty Days hath_ September, April, June, _and_ November; February _hath Twenty-eight alone_, _And all the rest have Thirty-one_.