# „... the famous assertion by Einstein that the length of a rod depends on its velocity and on the chosen definition of simultaneity.... is based on the fact that we do not measure the length of the rod, but its projection on a system at rest. How the length of the projection depends on the choice of simultaneity can be illustrated by reference to a photograph taken through a focal-plane shutter. Such a shutter... consists of a wide band with a horizontal slit, which slides down vertically. Different bands are photographed successively on the film. Moving objects are therefore strangely distorted; the wheels of a rapidly moving car for instance, appear to be slanted. The shape of the objects in the picture will evidently depend on the speed of the shutter. Similarly, the length of the moving segment depends on the definition of simultaneity. One definition of simultaneity differs from another because events that are simultaneous for one definition occur successively for another. What may be a simultaneity projection of a moving segment for one definition is a "focal-plane shutter photograph" for another.“

1891 - 1953

### „If the definition of simultaneity is given from a moving system, the spherical surface will result when Einstein's definition with є = 1/2 is used, since it is this definition which makes the velocity of light equal in all directions.“

—  Hans Reichenbach American philosopher 1891 - 1953

### „If two events are to be represented as occurring in succession, then—paradoxically—they must also be thought of simultaneously.“

—  Gerald James Whitrow British mathematician 1912 - 2000
Context: Our conscious appreciation of the fact that one event follows another is of a different kind from our awareness of either event separately. If two events are to be represented as occurring in succession, then—paradoxically—they must also be thought of simultaneously. As quoted by Max Jammer, Concepts of Simultaneity: From Antiquity to Einstein and Beyond (2008)

### „He could never decide whether to furgle them or photograph them, for he had found it impossible to do both simultaneously.“

—  Joseph Heller American author 1923 - 1999
pp.53-54. Dell 1962 edition. (First use of "furgle" in the United States.)

### „We define: any two events which are indeterminate as to their time order may be called simultaneous.... Simultaneity means the exclusion of causal connection.... Yet we must not commit the mistake of attempting to derive from it the conclusion that this definition coordinates to any given event at a given different place. This would be the case only for a special form of causal structure, a form that does not conform to physical reality.“

—  Hans Reichenbach American philosopher 1891 - 1953

### „The Universe consists of non-simultaneously apprehended events.“

—  Buckminster Fuller American architect, systems theorist, author, designer, inventor and futurist 1895 - 1983
As quoted by Robert Anton Wilson in Maybe Logic - The Lives and Ideas of Robert Anton Wilson (2003)

### „Thought is prior to language and consists in the simultaneous presentation to the mind of two different images.“

—  T. E. Hulme English Imagist poet and critic 1883 - 1917

### „All the indistinguishable photons illuminate the array of N slits, or grating, simultaneously. If only one photon propagates, at any given time, then that individual photon illuminates the whole array of N slits simultaneously.“

—  F. J. Duarte Chilean-American physicist 1954
in Dirac Optics,

### „The mind moves by instincts, associations and premonitions and not by fixed dates or completed processes. Action and reaction will occur simultaneously: or the cause actually be found after the effect.“

—  G. K. Chesterton English mystery novelist and Christian apologist 1874 - 1936
Context: The mind moves by instincts, associations and premonitions and not by fixed dates or completed processes. Action and reaction will occur simultaneously: or the cause actually be found after the effect. Errors will be resisted before they have been properly promulgated: notions will be first defined long after they are dead. Ch I: The Victorian Compromise and Its Enemies (p. 17)

### „As a Line, I say, is looked upon to be the Trace of a Point moving forward, being in some sort divisible by a Point, and may be divided by Motion one Way, viz. as to Length; so Time may be conceiv'd as the Trace of a Moment continually flowing, having some Kind of Divisibility from an Instant, and from a successive Flux, inasmuch as it can be divided some how or other. And like as the Quantity of a Line consists of but one Length following the Motion; so the Quantity of Time pursues but one Succession stretched out as it were in Length, which the Length of the Space moved over shews and determines. We therefore shall always express Time by a right Line; first, indeed, taken or laid down at Pleasure, but whose Parts will exactly answer to the proportionable Parts of Time, as its Points do to the respective Instants of Time, and will aptly serve to represent them. Thus much for Time.“

—  Isaac Barrow English Christian theologian, and mathematician 1630 - 1677
p, 125

### „The new and the old methods complete one another on numerous points, and their simultaneous use will increase our knowledge“

—  Bernard Lyot French astronomer 1897 - 1952
Context: The new and the old methods complete one another on numerous points, and their simultaneous use will increase our knowledge of the outer atmosphere of the Sun much more rapidly. The study of the solar corona and prominences without eclipses (George Darwin Lecture) in Monthly Notices of the Royal Astronomical Society (1939).

### „Across planes of consciousness, we have to live with the paradox that opposite things can be simultaneously true.“

—  Ram Dass American contemporary spiritual teacher and the author of the 1971 book Be Here Now 1931

### „It's amazing how we can do things simultaneously, like talking and not listening.“

—  Saul Gorn computer scientist 1912 - 1992
p. 11

### „We constantly use the word "simplify", but its meaning depends on what you are going to do next, and there is no uniform definition.“

—  Richard Hamming American mathematician and information theorist 1915 - 1998

### „Make at least one definite move daily toward your goal.“

—  Bruce Lee Hong Kong-American actor, martial artist, philosopher and filmmaker 1940 - 1973
Part 6 "Beyond System — The Ultimate Source of Jeet Kune Do"<!-- p. 372 -->

### „Length of course depends on the stupidity of the class...“

—  John Fisher, 1st Baron Fisher Royal Navy admiral of the fleet 1841 - 1920
Fisher's notes in the front cover of his own copy of A Short Treatise on Electricity and the Management of Electric Torpedoes (1868) Fisher of Kilverstone (1973), Ruddock F. Mackay, Clarendon Press, p. 48.

### „Every physicist (naturally, this equally applies to other specialities, but I re- strict myself to physicists for definitiveness) should simultaneously know, apart from theoretical physics, a wealth of facts from different branches of physics and be familiar with the newest notable accomplishments.“

—  Vitaly Ginzburg Russian Physicist 1916 - 2009
in his Nobel lecture http://nobelprize.org/nobel_prizes/physics/laureates/2003/ginzburg-lecture.html, December 8, 2003, at Aula Magna, Stockholm University.