Image Questions
What is Karl Popper (1902--1994) known for?
What is this an image of?
What is this an image of?
What is this an image of?
What physical phenomena are shown in the image?
Image Answers
Caption: "Karl Popper (1902--1994) in 1990."
Popper is an important modern philosopher known for emphasizing the concept of the falsifiability of scientific theories and his book The Open Society and Its Enemies (Popper, K. 1945).
Credit: Unknown photographer.
Linked from Wikipedia.
Permission: No known restrictions.
Caption: "Boxplot representing Michelson and Morley's data on the speed of light. It consists of five experiments, each made of 20 consecutive runs.'' Here we see the five results with error bars. The data are consistent with each other within in error and the modern value to nearly within error.
The Michelson-Morley experiment (1887) is considered to be the first strong evidence for the invariance of the vacuum light speed
Using interferometry, Michelson & Morley showed that the near vacuum light speed (actually the speed of light in air) was independent of the Earth's motion through space.
Credit: User:Schutz
From Wikipedia.
Permission: Public domain at least in USA.
Caption: "A simple illustration showing the basic elements of Ptolemaic astronomy. It shows a planet rotating on an epicycle which is itself rotating around a deferent inside a crystalline sphere. The center of the system is marked with an X, and the earth is slightly off of the center. Opposite the earth is the equant point, which is what the planetary deferent would actually rotate around. Distances have been exaggerated as has the simplicity for the purposes of illustration."
Credit: User:Fastfission
From Wikipedia.
Permission: Public domain at least in USA.
Caption: A schematic comparison of he Ptolemaic geocentric solar system and geocentric solar system.
Credit: User:Nikolang
From Wikipedia
Permission: Licensed under the Creative Commons Attribution ShareAlike 2.5.
Caption: "The Pinhole Projection Method of observing partial w:Solar Eclipse.At the insert in the upper left corner of this image you could see the partially eclipsed sun that was photographed with a white solar filter. At the bottom of the image you could see the projection of the partially eclipsed sun."
Date: 2006mar29.
This is a bit fancy to get multiple crescent images.
Actually light filtering through trees can give multiple crescent images during a partial solar eclipse---or so I'm told.
Credit: Mila Zinkova.
Linked from Wikipedia.
Permission: Licensed under the Creative Commons Attribution ShareAlike 2.5.
