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The physicists of the early 20th century were unaware of two ideas which arevital to understanding some aspects of modern physics within classical theory.The two ideas are: 1) the presence of classical electromagnetic zero-pointradiation, and 2) the importance of special relativity. In classes of modernphysics today, the problem of blackbody radiation within classical physics isstill described in the historical context of the early 20th century. However,the inclusion of classical zero-point radiation and of relativity now allows acompletely satisfactory classical understanding of blackbody radiation with thePlanck spectrum, as well as of some other aspects of modern physics. Here wesketch the current classical understanding of blackbody radiation, pointing outthat thermodynamics allows the presence of classical zero-point radiation, andthat use of nonrelativistic physics leads to the Rayleigh-Jeans spectrum whilerelativistic physics gives the Planck spectrum. The current textbooks of modernphysics are a century out of date in presenting the connections betweenclassical and quantum physics.

Classical Zero-Point Radiation and Relativity: The Problem of Blackbody Radiation Revisited