The anthropic principle is often criticized for lacking falsifiability and therefore critics of the anthropic principle may point out that the anthropic principle is a non-scientific concept, even though the weak anthropic principle, " conditions that are observed in the universe must allow the observer to exist ", is " easy " to support in mathematics and philosophy, i. e. it is a tautology or truism

If the large-scale Universe appears isotropic as viewed from Earth, the cosmological principle can be derived from the simpler Copernican principle, which states that there is no preferred ( or special ) observer or vantage point.

In practice, it is very difficult, and at times arguably impossible, to adopt the point of view of an ideal observer.

The axis pointing downward ( and to the right ) is also meant to point towards the observer, whereas the " middle " axis is meant to point away from the observer.

However, it permits distortions in spacetime that allow an object to move faster than light from the point of view of a distant observer.

A point on the Equator that passes directly in front of this observer later in time has a higher planetographic longitude than a point that did so earlier in time.

Relative velocity is the motion of an object from the point of view of an observer in a frame of reference.

Sutton designed the script to be written horizontally, like English, and from the point of view of the observer, but changed it to vertical and from the point of view of the signer, to conform to the wishes of Deaf writers.

From the point of view of an observer on the Earth's surface the second of TCG passes in slightly less than the observer's SI second.

A present is defined as a set of events that are simultaneous from the point of view of a given observer.

Harsanyi claimed that his theory is indebted to Adam Smith, who equated the moral point of view with that of an impartial but sympathetic observer ; to Kant who insisted on the criterion of universality and which may also be described as a criterion of reciprocity ; to the classical utilitarians who made maximising social utility the basic criterion of morality ; and to ‘ the modern theory of rational behaviour under risk and uncertainty, usually described as Bayesian decision theory ’.

During a shower, a multitude of meteors arrive from the same direction, and, from the perspective of an observer, their glowing trails appear to radiate from a single point in space.

He did not analyze them objectively, but from the point of view of their inner effect on the observer.

Fermat's principle is the main principle of quantum electrodynamics where it states that any particle ( e. g. a photon or an electron ) propagates over all available ( unobstructed ) paths and the interference ( sum, or superposition ) of its wavefunction over all those paths ( at the point of observer or detector ) gives the correct probability of detection of this particle ( at this point ).

The azimuth is the angle formed between a reference direction ( North ) and a line from the observer to a point of interest projected on the same plane as the reference direction.

The vector from an observer ( origin ) to a point of interest is projected perpendicularly onto a reference plane ; the angle between the projected vector and a reference vector on the reference plane is called the azimuth.

This means any point within it, including that occupied by the observer, can be considered the center.

The essential idea behind relational quantum mechanics, following the precedent of special relativity, is that different observers may give different accounts of the same series of events: for example, to one observer at a given point in time, a system may be in a single, " collapsed " eigenstate, while to another observer at the same time, it may be in a superposition of two or more states.

Until the Cuban fiasco and the Communist military victories in Laos, almost any observer would have said that President Kennedy had blended a program that respected, generally, the opinions voiced both by Mr. Nixon and the professors.

However, he thinks that these too occur out of necessity since an outside observer can see the same regularity that he would in a purely physical system.

The apparent magnitude ( m ) of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.

The absolute magnitude is then equivalent to the apparent magnitude an object would have if it were at a standard luminosity distance ( 10 parsecs ) away from the observer, in the absence of astronomical extinction.

In this case, the absolute magnitude is defined as the apparent magnitude that the object would have if it were one astronomical unit ( AU ) from both the Sun and the observer.

The light beam from a distant object cannot itself have any transverse velocity component, or it could not ( by definition ) be seen by the observer, since it would miss the observer.

Eta Bootis, or Muphrid, is only 3. 3 light years distant from Arcturus, and would have a visual magnitude-2½, whereas an observer on the former system would find Arcturus as bright as Venus as seen from Earth.

Because of this property, the collapsed stars were called " frozen stars ," because an outside observer would see the surface of the star frozen in time at the instant where its collapse takes it inside the Schwarzschild radius.

The particular characteristics of this ideal observer can vary from an omniscient observer, who would grasp all the consequences of any action, to an ideally informed observer, who knows as much as could reasonably be expected, but not necessarily all the circumstances or all the possible consequences.

An observer unaware of the rotation would expect this to be zero in the absence of outside forces.

At that time the French and Chinese reconvened Geneva peace talks ; Eisenhower agreed the U. S. would participate only as an observer.

The speed of light and other EMR predicted by Maxwell's equations did not appear unless the equations were modified in a way first suggested by FitzGerald and Lorentz ( see history of special relativity ), or else otherwise it would depend on the speed of observer relative to the " medium " ( called luminiferous aether ) which supposedly " carried " the electromagnetic wave ( in a manner analogous to the way air carries sound waves ).

According to phenomenalism, to say that a normal observer is present is to make the hypothetical statement that were a doctor to inspect the observer, the observer would appear to the doctor to be normal.

If we are to specify this doctor's normality in sensory terms, we must make reference to a second doctor who, when inspecting the sense organs of the first doctor, would himself have to have the sense data a normal observer has when inspecting the sense organs of a subject who is a normal observer.

In response to Haeckel ’ s evolutionary claim that all vertebrates are essentially identical in the first month of embryonic life as proof of common descent, His responds by insisting that a more skilled observer would recognize even sooner that early embryos can be distinguished.

In 1907, beginning with a simple thought experiment involving an observer in free fall, he embarked on what would be an eight-year search for a relativistic theory of gravity.

with F the net force ( a vector ), m the mass of a particle and a the acceleration of the particle ( also a vector ) which would be measured by an observer at rest in the frame.

In both cases, application of Newton's second law would not work for the rotating observer without invoking centrifugal and Coriolis forces to account for their observations ( tension in the case of the spheres ; parabolic water surface in the case of the rotating bucket ).

Occasionally, you may come across one or two bumblebees in the cold season, when you are turning over sods in your garden, but you have to be a really keen observer to see them at all.

Since the earth is rotating and the unleveled gyro-stabilized platform is fixed with respect to a reference in space, an observer on the earth will see the platform rotating ( with respect to the earth ).

An expanding universe generally has a cosmological horizon which, by analogy with the more familiar horizon caused by the curvature of the Earth's surface, marks the boundary of the part of the universe that an observer can see.

This is due to the superposition, or interference, of different parts of a wave that traveled to the observer by different paths ( see diffraction grating ).

And if we are to specify in sensory terms that the second doctor is a normal observer, we must refer to a third doctor, and so on ( also see the third man ).

For example, the sentence " The coat is red " has no observer, the sentence " We see the coat as red " ( where " we " indicates observers ) appears more specific in context as regards light waves and colour as determined by modern science, that is, colour results from a reaction in the human brain.

For example, an observer will see a ball fall the same way in a rocket ( left ) as it does on Earth ( right ), provided that the acceleration of the rocket provides the same relative force.

An observer sitting on the ( drifting ) perijove will see the moons coming into conjunction in the same place ( elongation ).

Heisenberg offered such an observer effect at the quantum level ( see below ) as a physical " explanation " of quantum uncertainty.

This means that the interior black hole region can contain a mix of particles that fell in from either universe ( and thus an observer who fell in from one universe might be able to see light that fell in from the other one ), and likewise particles from the interior white hole region can escape into either universe.

* Observer is a publish / subscribe pattern which allows a number of observer objects to see an event.

Typically, an observer from our world will journey to another place or time and see one society the author considers ideal, and another representing the worst possible outcome.

Implied in this position is that it is as projected onto the celestial sphere ; any observer at any location looking in that direction would see the " geocentric Moon " in the same place against the stars.

If there is any misalignment the observer will see an arc segment instead.

The observer may then see multiple distorted images of the same source ; the number and shape of these depending upon the relative positions of the source, lens, and observer, and the shape of the gravitational well of the lensing object.

To compute the greatest distance at which an observer can see the top of an object above the horizon, compute the distance to the horizon for a hypothetical observer on top of that object, and add it to the real observer's distance to the horizon.

Thus an observer on a beach can see the top of the tower as long as it is not more than 40. 35 km away.

Conversely, if an observer on a boat () can just see the tops of trees on a nearby shore (), the trees are probably about 16 km away.

An observer needs to be within an atmospheric duct to be able to see a Fata Morgana.

In such instances, the observer may see only a flash of light without hearing any thunder.