ABSTRACT
This is the month, and twelve of them are in technical language called a lunar year.
The natural year is the period of a revolution of the Solar sun in the ecliptic. We call it the natural, because it month. comprehends all the stages in the process of generation which revolve through the four seasons of the year. In the course of it, the rays of the sun as passing through a window-glass and the shadows of the sundials reass ume the same size, position, and direction in which, or from which, they commenced. This is the year, and is called the solar one, in antithesis to the lunar year. As the lunar month is the twelfth part of the lunar year, the twelfth part of the solar year is a solar month in theory, the calculation being based on the mean rotation of the sun. If, however, the calculation is based on his varying rotation, a solar month is the period of his staying in one sign of the zodiac.
