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Nodes in Spherical Harmonics

Physics Asked on December 8, 2021

In Rydberg Atoms book by Thomas F. Gallagher, Page 14, the author provides the general equation of spherical harmonics which is well-known. He states that there exist $l-m$ nodes in the $theta$ coordinate, and none in the $phi$ coordinate. The coordinate system taken by the author is given below in the figure.

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I understand the concept of nodes and how to count them for each orbital. I am trying to visualize the direction of these nodes but I cannot understand how these nodes are in the $theta$ coordinate not in the $phi$ coordinate.

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