Annus Mirabilis papers
Annalen der Physik receives Einstein's light-quantum paper
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Original prompt & settings (JSON) ↗The date usually celebrated as Einstein's submission is the journal's receipt stamp. He had sent the paper from Bern the day before, three days after turning 26.
18 March 1905: what the date actually records
Einstein sent “On a Heuristic Point of View Concerning the Production and Transformation of Light” from Bern on 17 March 1905. Annalen der Physik recorded its receipt on 18 March — a journal receipt date, not necessarily the day he submitted or mailed it.
He was 26, and had signed the paper three days after his birthday. In a private letter later that spring he called it “very revolutionary.”
The engine of the paper was entropy
The argument ran from the thermodynamics of dilute, high-frequency radiation: light behaves as if its energy were concentrated in mutually independent, spatially localized quanta proportional to frequency. The claim was deliberately heuristic — behaves as if, not is.
Einstein applied the hypothesis to three phenomena: photoluminescence, the photoelectric effect and the ionization of gases. The famous photoelectric prediction — maximum electron energy rising linearly with frequency once the material's work function is subtracted — was one application of the three.
Nothing was settled that day
The receipt began the journal's publication process rather than producing a public scientific event. The paper appeared on 9 June 1905, at pages 132–148.
The light-quantum hypothesis stayed controversial for roughly two decades. Millikan confirmed Einstein's photoelectric equation about a decade later while still rejecting the light-quantum interpretation behind it.
Sources
Researched 23 Aug 2026 5 sources 2 audit passes
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What the sources leave uncertain
- The date is secure as Annalen der Physik’s receipt date. The American Institute of Physics chronology says Einstein sent the manuscript on March 17, while the listed title calls March 18 the submission date.
- Translations vary between “heuristic viewpoint” and “heuristic point of view,” and between “production,” “creation,” “generation” and “transformation” of light.