In 1900 Rubens visited Planck on the 7th or the 20th of october?

José Maria Filardo Bassalo @Jose_Maria_Bassalo

02 February 2018 1 5K Report

Historians always refer to a visit made on October 7, 1900 by Rubens to Planck, in which he reports his experimental results to Planck, as being decisive for Plancks elaboration of his law. However in his Biography Planck does not mention this visit but a visit made on the 20th of October. Since Planck does not mention this visit on the 7th, we would like to know if this visit on the 7th actually occurred, or if it happened on the 20th, or if both visits occurred?

Thierry De Mees

Can it have a link with the pre-Soviet calendar, depending on the origin and period of the historians?

https://en.wikipedia.org/wiki/Soviet_calendar

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