“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

The Philosophy of Space and Time (1928, tr. 1957)

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Hans Reichenbach 41

American philosopher 1891–1953

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“…absolute time would exist in a causal structure for which the concept indeterminate as to time order lends to a unique simultaneity, i. e., for which there is no finite interval of time between the departure and return of a first-signal…”

Hans Reichenbach (1891–1953) American philosopher

The Philosophy of Space and Time (1928, tr. 1957)

C.G. Jung book Synchronicity: An Acausal Connecting Principle

Source: Synchronicity: An Acausal Connecting Principle (1960), p. 5
Context: We Shall Naturally look round in vain the macrophysical world for acausal events, for the simple reason that we cannot imagine events that are connected non-causally and are capable of a non-causal explanation. But that does not mean that such events do not exist... The so-called "scientific view of the world" based on this can hardly be anything more than a psychologically biased partial view which misses out all those by no means unimportant aspects that cannot be grasped statistically.

“In relativity, movement is continuous, causally determinate and well defined, while in quantum mechanics it is discontinuous, not causally determinate and not well defined. Each theory is committed to its own notions of essentially static and fragmentary modes of existence (relativity to that of separate events, connectable by signals, and quantum mechanics to a well-defined quantum state). One thus sees that a new kind of theory is needed which drops these basic commitments and at most recovers some essential features of the older theories as abstract forms derived from a deeper reality in which what prevails in unbroken wholeness.”

David Bohm book Wholeness and the Implicate Order

Wholeness and the Implicate Order (1980)

“…introduce the auxiliary concept of first-signal…defined as the fastest message carrier between any two points in space. We now send a first-signal from P, calling the event of departure E1… The event of its arrival at P' is called E'. Simultaneously with the arrival of this signal, another first signal is sent from P'. The arrival of this signal at P is the event E2. …the time interval between E1 and E2 is coordinated to the event E', [E1 is earlier than E' and E2 is later than E'] and every event of this time interval except for the endpoints is inderterminate as to the time order relative to E.”

Hans Reichenbach (1891–1953) American philosopher

The Philosophy of Space and Time (1928, tr. 1957)

“We Shall Naturally look round in vain the macrophysical world for acausal events, for the simple reason that we cannot imagine events that are connected non-causally and are capable of a non-causal explanation. But that does not mean that such events do not exist… The so-called "scientific view of the world" based on this can hardly be anything more than a psychologically biased partial view which misses out all those by no means unimportant aspects that cannot be grasped statistically.”

C.G. Jung book Synchronicity: An Acausal Connecting Principle

Source: Synchronicity: An Acausal Connecting Principle (1960), p. 5

“We have now isolated four "ideal types" of causal texture, approximations to which may be thought of as existing simultaneously in the "real world" of most organizations--though, of course, their weighting will vary enormously from case to case.”

Fred Emery (1925–1997) Australian psychologist

Source: The Causal Texture of Organizational Environments (1963), p. 27.

“"I exist" does not follow from "there is a thought now." The fact that a thought occurs at a given moment does not entail that any other thought has occurred at any other moment, still less that there has occurred a series of thoughts sufficient to constitute a single self. As Hume conclusively showed, no one event intrinsically points to any other. We infer the existence of events which we are not actually observing, with the help of general principle. But these principles must be obtained inductively. By mere deduction from what is immediately given we cannot advance a single step beyond. And, consequently, any attempt to base a deductive system on propositions which describe what is immediately given is bound to be a failure.”

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), p. 47.

“We have not a direct intuition of simultaneity, nor of the equality of two durations. If we think we have this intuition, this is an illusion. We replace it by the aid of certain rules which we apply almost always without taking count of them.
…We …choose these rules, not because they are true, but because they are the most convenient, and we may recapitulate them as follows: "The simultaneity of two events, or the order of their succession, the equality of two durations, are to be so defined that the enunciation of the natural laws may be as simple as possible. In other words, all these rules, all these definitions, are only the fruit of an unconscious opportunism."”

Henri Poincaré book The Value of Science

Source: The Value of Science (1905), Ch. 2: The Measure of Time

“The universe was a language with a perfectly ambiguous grammar. Every physical event was an utterance that could be parsed in two entirely different ways, one causal and the other teleological.”

Ted Chiang book Stories of Your Life and Others

Story of Your Life; first appeared in Starlight 2, 1998.
Stories of Your Life and Others (2002)

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

Gerald James Whitrow (1912–2000) British mathematician

As quoted by Max Jammer, Concepts of Simultaneity: From Antiquity to Einstein and Beyond (2008)
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.

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