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Here we show that within classical physics, the Planck blackbody spectrum canbe derived directly from the structure of relativistic spacetime. Innoninertial frames, thermal radiation at positive temperature is connecteddirectly to zero-point radiation whose spectrum follows from the geodesicstructure of the spacetime. The connection between zero-point radiation andthermal radiation at postive temperature is through a time-dilating conformaltransformation in the noninertial frame. Transferring the spectrum back toMinskowski spacetime, the Planck spectrum is obtained.

The Planck Blackbody Spectrum Follows from the Structure of Relativistic Spacetime