Pi (π) is the ratio of the circumference of a circle to its diameter. As a fraction, its closest approximations are 22/7, 333/106 and 355/113. |
Projection on the plane of the ecliptic of the parabolic orbits of 72 comets, 1802. Engraving by Wilson Lowry after Johann Elert Bode. |
Circle of Fifths, and relationship of relative minor keys to major key signatures. |
"The
circle is one of the noblest representations of Deity, in his noble
works of human nature. It bounds, determines, governs, and dictates
space, bounds latitude and longitude, refers to the Sun, Moon, and all
the planets, in direction, brings to the mind thoughts of eternity, and
concentrates the mind to imagine for itself the distance and space it
comprehends. It rectifies all boundaries; it is the key to information
of the knowledge of God; it points to each and every part of God's noble
work."
John Davis (1845): The Measure of the Circle [p. 12].
John Davis (1845): The Measure of the Circle [p. 12].