Parallactic second is the unit of distance as the abbreviation of a parallactic second is of parsec.
Parsec = Parsec is a unit of larger distances. It is the distance at which stars would create parallax of one second of arc.
1 parsec = 3.26 light-years
The distance which is drawn as the line from the center of the Earth up to the Sun center, will cross subtending a 1-second angle with each other. It expresses the physical meaning of the parsec.
Parsec is the unit of the length used to explain the distance between stars to galaxies. Professional astronomers use it. It represents the distance from which the radius of the Earth's orbit decreases by one second of the arc. Therefore, a star at a parse distance has a parallax of one second, and the distance of an object in the parsec is the interval of its parallax in seconds of the arc.
For example, the nearest star that is part of the Alpha Centauri triple-star system is Proxima Centauri, which has an arc parallax of 0.769 seconds. Hence, its distance from the sun and Earth is 1.30 parsec. A parsec is equal to 3.26 light-years, equivalent to 3.09 × 1013 km (1.92 × 1013 mi).
1. Explain distance and displacement with examples
The distance of an object which does not depend on the direction of the motion is known as the scalar quantity. The distance can also be described as the complete path traveled by an object; for example, if a jeep travels 5 km east and then takes a turn and travel 9 km north, the total distance traveled by the vehicle will be 14 km. It can never be negative or zero, and it is always more than the displacement of the object. Complete information is provided by the distance about the path traveled by the object.
Displacement depends on the direction of the motion of the object; hence it's a vector quantity. It can also be described as the object's overall motion or the minimum distance between the starting point and final point of the object. Considering the above example, the total displacement of the object will be the length of the line joining the starting and the final positions. The displacement of an object is generally shorter than the distance traveled by the object. But proper information is not provided by the displacement for the path traveled by the object.
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