NOTE: This page uses common physics notation for spherical coordinates, in which is the angle between the z axis and the radius vector connecting the origin to the point in question, while is the angle between the projection of the radius vector onto the x-y plane and the x axis. Several other definitions are in use, and so care must be taken in comparing different sources.
Famous quotes containing the word fields:
“Ah happy hills! ah pleasing shade!
Ah fields beloved in vain!
Where once my careless childhood stray’d,”
—Thomas Gray (1716–1771)