![]() ![]() 30.9 trillion kilometres (19.2 trillion miles). In this case, the object's distance in parsecs is numerically equal to the reciprocal of half the number of arcseconds by which its position appears to change. The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,000 astronomical units (au), i.e. After six months, the Earth is at the opposite end of its orbit around the Sun, a distance equal to twice the base of the right triangle described above. ![]() It becomes quite convenient for astronomers to determine the object's distance by simply measuring its apparent motion in the sky over a 6-month interval. The angle can be measured by observing the object's precise location in the sky. A parsec is equivalent to 3.26 light years, and since a light year is the distance light travels in 1. sec \ pr-sek \ Definition of parsec : a unit of measure for interstellar space that is equal to 3. Now, if the angle formed between the line drawn from the object to the Earth and the line drawn from the object to the Sun is exactly one arcsecond, then the object's distance from the Sun would be exactly one parsec. One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond. In other words, imagine that a straight line is drawn from the object to the Earth, a second line is drawn from the Earth to the Sun, and a third line is drawn from the object to the Sun that is perpendicular to the line drawn from the Earth to the Sun. A parsec is defined as the length of the adjacent side of this right triangle in space when the parallax angle is 1 arcsecond. A parsec is the distance from the Sun to an astronomical object which has a parallax angle of one arcsecond. The parsec is defined to be the distance at. The name parsec is "an abbreviated form of 'a distance corresponding to a parallax of one arcsecond'." It was coined in 1913 at the suggestion of British astronomer Herbert Hall Turner. The other commonly used unit in astronomy and in Star Trek is called the Parsec (parallax of one arc second). The parsec is a unit of length used in astronomy, equal to about 30.9 trillion kilometres or 3.26 light-years. The less an object appears to have moved, the farther it is from the Sun, and vice versa.Freebase (0.00 / 0 votes) Rate this definition: of the Milky Way, our local galaxy, the parsec (pc) is the usual choice. Given that the tangent of an angle is opposite/adjacent and the opposite side is 1 AU, then the parsec is 1AU/tan(1). parsec \ pr-sek \ Definition of parsec : a unit of measure for interstellar space that is equal to 3. In this case, the object's distance in parsecs is numerically equal to the reciprocal of half the number of arcseconds by which its position appears to change. The IAU also defines other astronomical units: the astronomical unit of time is. Now, if the angle formed between the line drawn from the object to the Earth and the line drawn from the object to the Sun is exactly one arcsecond, then the object's distance from the Sun would be exactly one parsec. Defination :- A parsec was defined as the distance at which one astronomical unit subtends an angle of one arcsecond. One parsec corresponds to the distance at which the mean radius of the earth's orbit subtends an angle of one second of arc. In other words, imagine that a straight line is drawn from the object to the Earth, a second line is drawn from the Earth to the Sun, and a third line is drawn from the object to the Sun that is perpendicular to the line drawn from the Earth to the Sun. It is a unit of distance used in astronomy, equal to about 3.26 light years (3.086 × 10 13 kilometres). The name parsec is "an abbreviated form of 'a distance corresponding to a parallax of one arcsecond'." It was coined in 1913 at the suggestion of British astronomer Herbert Hall Turner. Freebase (0.00 / 0 votes) Rate this definition: ![]()
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