---
title: "Scientific phenomena named after people"
chunk: 9/10
source: "https://en.wikipedia.org/wiki/Scientific_phenomena_named_after_people"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T04:01:38.936512+00:00"
instance: "kb-cron"
---

== S ==
Sabatier or Sabattier effect – Sabat[t]ier, first name unknown
Sachs–Wolfe effect – Rainer K. Sachs and Arthur M. Wolfe
Saffir–Simpson hurricane wind scale – Herbert S. Saffir and Robert ("Bob") Simpson
Sagnac effect – Georges Sagnac
Saha ionization equation (a.k.a. Saha–Langmuir equation) – Megh Nad Saha (মেঘনাদ সাহা) (and Irving Langmuir)
Salem number – Raphaël Salem
Sapir–Whorf hypothesis – Edward Sapir and Benjamin Whorf
Sasakian manifold, metric – Shigeo Sasaki
Say's law – Jean-Baptiste Say
Scheerer's phenomenon (Blue field entoptic phenomenon) – Richard Scheerer
Schering Bridge – Harald Schering
Schild plot, regression analysis – Heinz Otto Schild
Schmidt law, Schmidt–Kennicutt law – see Kennicutt–Schmidt law, above
Schottky effect – Walter H. Schottky
Schröter effect – Johann Hieronymus Schröter
Schülen–Wilson effect – see Wilson effect, below
Schuler period, tuning – Maximilian Schuler
Schultz's rule – Adolph Hans Schultz
Schumann–Runge bands – Victor Schumann and Carle David Tolmé Runge
Schwabe solar cycle – Samuel Heinrich Schwabe
Schwarzschild effect, metric, radius – Karl Schwarzschild
Scott effect – Elizabeth L. Scott
Secchi (stellar) class, depth, disk – Pietro Angelo Secchi
Seebeck effect – Thomas Johann Seebeck
Seiberg–Witten gauge theory – Nathan Seiberg and Edward Witten
Seiberg–Witten invariant – Nathan Seiberg and Edward Witten
Senftleben–Beenakker effect – Hermann Senftleben and Jan J. M. Beenakker
Sertoli cells – Enrico Sertoli
Serre duality – Jean-Pierre Serre
Seyfert galaxy – Carl Keenan Seyfert
Shapiro effect – Irwin Shapiro
Shimizu–Morioka attractor, equations – Tatsujiro Shimizu and Nozomi Morioka
Shubnikov–de Haas effect – Wander Johannes de Haas and Lev Vasiljevich Shubnikov
Sieberg tsunami intensity scale – August Heinrich Sieberg
Sieberg–Ambraseys tsunami intensity scale – August Heinrich Sieberg and Nicholas Ambraseys
Simmons–Smith reaction – Howard Ensign Simmons, Jr.
Simpson's paradox (a.k.a. Yule–Simpson effect) – Edward H. Simpson (and Udny Yule)
Simroth's organs – Heinrich Rudolf Simroth
Smale's horseshoe – Stephen Smale
Smale–Rössler theorem – Stephen Smale and Otto Rössler
Smith–Waterman algorithm – Temple F. Smith and Michael S. Waterman
Snell's law – Willebrord van Roijen Snell
Soloviev tsunami intensity scale – Sergey L. Soloviev
Sommerfeld–Kossel displacement law – Arnold Sommerfeld and Walther Kossel
Sørensen similarity index, similarity coefficient – Thorvald Sørensen
Spörer's law, Spörer Minimum – Gustav Spörer
St. Elmo's fire – Erasmus of Formiae
St. Robert's law (a.k.a. Vieille's law) – Comte Paul Ballada de Saint-Robert, a.k.a. Conte Paolo Ballada di San Roberto (1815–1888)
Staebler–Wronski effect – David L. Staebler and Christopher R. Wronski
Stark effect (a.k.a. Stark–Lo Surdo effect) – Johannes Stark (and Antonino Lo Surdo)
Stark ladder (a.k.a. Wannier–Stark ladder, q.v.) – Johannes Stark and Gregory Hugh Wannier
Stark–Einstein law – Johannes Stark and Albert Einstein
Stebbins–Whitford effect – Joel Stebbins and Albert Edward Whitford
Stefan's constant, law (a.k.a. Stefan–Boltzmann constant, law) – Jožef Stefan (and Ludwig Boltzmann)
Stensen's duct – Niels Stensen
Stern–Levison parameter – S. Alan Stern and Harold F. Levison
Stevens effect – Joseph C. and Stanley Smith Stevens
Stevens's power law – Stanley Smith Stevens
Stewart's organs – Charles Stewart
Stewart–Tolman effect – Thomas Dale Stewart and Richard Chace Tolman
Stigler's law of eponymy – Stephen Stigler
Stirling number – James Stirling
Stokes radius – George Gabriel Stokes
Stokes shift – George Gabriel Stokes
Stolper–Samuelson theorem – Paul Samuelson and Wolfgang Stolper
Strömgren age, photometry, sphere – Bengt Georg Daniel Strömgren
Strömgren–Crawford photometry – Bengt Georg Daniel Strömgren and David L. Crawford
Stroop effect – John Ridley Stroop
Strouhal number – Vincenc Strouhal
Stueckelberg action – Ernst Carl Gerlach Stueckelberg
Sturgeon's law – Theodore Sturgeon
Sturmian trajectories – Charles François Sturm
Suess effect – Hans Eduard Suess
Suess solar cycle, DeVries solar cycle, Suess-DeVries solar cycle – Hans Eduard Suess and Hessel de Vries
Sunyaev–Zel'dovich effect – Rashid Sunyaev and Yakov Zel'dovich
Syracuse problem – see Collatz conjecture, above
Szilard–Chalmers effect – Leó Szilárd and Thomas A. Chalmers

== T ==
Tait–Bryan angles (a.k.a. Cardan angles, nautical angles) – Peter Guthrie Tait and George H. Bryan
Talbot effect – William Henry Fox Talbot
Tanimoto coefficient, distance, measure, score, similarity – Taffee T. Tanimoto
Taylor cone – Geoffrey Ingram Taylor
Taylor-Couette flow – Geoffrey Ingram Taylor and Maurice Marie Alfred Couette
Teller–Ulam design – Edward Teller and Stanislaw Ulam
Thévenin's theorem – Léon Charles Thévenin
Thirring effect – see Lense–Thirring effect, above
Thomas precession – Llewellyn Thomas
Thomas–Fermi approximation, model – Llewellyn Hilleth Thomas and Enrico Fermi
Thomson cross-section, effect – William Thomson, 1st Baron Kelvin
Thomson structure (a.k.a. Widmanstätten pattern) – William (Guglielmo) Thomson (or Count Alois von Beckh Widmanstätten)
Thorndike's laws (of effect, readiness, and exercise) – Edward L. Thorndike
Thorson's rule – Gunnar Thorson
Thouless energy – David J. Thouless
Thwaites conjecture – see Collatz conjecture, above
Tiedemann's bodies – Friedrich Tiedemann
Tiffeneau–Demjanov rearrangement – Marc Tiffeneau and Nikolai Demyanov
Tobin's q – James Tobin
Tolman effects – Richard Chace Tolman
Tolman–Oppenheimer–Volkoff limit – Richard Chace Tolman, J. Robert Oppenheimer, and George Michael Volkoff
Tonks–Girardeau gas – Lewi Tonks and Marvin D. Girardeau
Townsend effect (a.k.a. Ramsauer effect, Ramsauer–Townsend effect), ionization coefficient – John Sealy Townsend
Troxler's effect/fading – Ignaz Paul Vital Troxler
Tychonoff space – Andrey Nikolayevich Tychonoff
Tyndall effect/scattering – John Tyndall

== U ==
Ulam conjecture – see Collatz conjecture
Ulam's packing conjecture – Stanislaw Ulam
Unruh effect – William G. Unruh