![]() Astronomers take advantage of these two opposite positions.įor examples astronomers measure the position of a star in December and then measure the position of same star in June when the position of Earth is exactly opposite in its orbit and it’s the diameter of the Earth’s orbit. So after 6 months it is at the opposite position from where it started journey in its orbit. after 12 months it is at the same position from where it started journey 12 months ago. As the Earth rotates around the Sun in every 12 months i.e. Now let’s take the two positions of the Earth instead of your two eyes. However in reality your finger is at the same position. If you do it repeatedly then you’ll see your finger is moving. Now look at your finger by looking the background object with your left eye and then close the left eye and look at your finger with your right eye. Now look at the background wall or some object along the same line of sight with your finger. Please extend your one hand and hold one finger in front of your face. What is parallax effect? Parallax of the nearest star Proxima Centauri as seen from the New Horizons spacecraft and from the Earth. I am explaining the two terms one by one. So the word parsec consists with two terms PARallax and arc SECond. In mathematics one parsec is the distance at which an object’s parallax angle is one arcsecond. One astronomical unit (au) is approximately the average distance from the Sun to the Earth and it is 150 million kilometers or 93 million miles. I’m explaining to you in a very easy way. Looking little bit complicated! Please wait. It is the distance at which one astronomical unit (au) subtends an angle of one arcsecond according to IAU. In astronomy it is defined in terms of astronomical unit (au). Though the term “sec” is present in the word parsec however it is not the unit of time. For the measurement of interstellar distances professional astronomers are often used parsec as an alternative to the light-year. Parsec is a unit of length used by professional astronomers for the measurement of vast distances. In terms of meter, one parsec is equals to 3.0857*10 16 meters. In terms of astronomical unit (au), one parsec is equals to 206265 astronomical units. In terms of light-year, one parsec is equals to 3.26 light-years approximately. ![]()
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