Full moon is called a blue moon. The term "blue moon" used in this sense may date to as early as the 16th century, but it became well known in the United States due to the "Farmers' Almanac" (published since 1818). According to the "Farmers' Almanac", a "blue moon" is the third full moon in any period between either solstice and equinox, or between equinox and solstice, (calculated using the mean tropical year), which contains four full moons. These seasons are equal in length, unlike the astronomical ones, which vary in length depending on the Earth's speed in its elliptical orbit round
Autumn Moon Over the Calm Lake Autumn Moon Over the Calm Lake Autumn Moon Over the Calm Lake (平湖秋月) is a Chinese folk song that was written by Lü Wencheng in the 1930s and is considered his most representative piece. He composed the music on a visit to the famous West Lake in Hangzhou, and is a sublime expression of his veneration for the beauty and grace of the scenery. The West Lake has been considered since the ancient times as a gorgeous place of tranquility, and the music illustrates the atmosphere and feel of the place with placid suppleness. Wencheng incorporated elements of the Zhejiang