
Explain parallax method for measuring distance of a nearly star.
Answer
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Hint: This problem can be solved by drawing a proper diagram by visualisation of position of earth and nearly star. Parallax is a method based on measuring two angles and sides of a triangle formed by the star, earth on one side and other side six month later. Astronomers find the distance of nearby stars in space by using a parallax method.
Formula used: Parallax Formula
Here the distance to the star (in parsecs)
The parallax angle of the star (in arc seconds)
Complete step by step answer:
Parallax is a method based on measuring two angles and sides of a triangle formed by the star, earth on one side and the other side six month later. Astronomers find the distance of nearby stars in the space by using a parallax method.
First let us draw a diagram to understand the problem better.
Astronomers use an effect to find the distance to a nearby star. Its apparent displacement by comparing the distance of star respect to the earth.
Step-1 See the position of an object (nearby star) once and then again six month later.
Step-2 calculate the change in position by finding the angle of parallax
There is simple relation between star distance and its parallax
Parallax Formula
Here the distance to the star (in parsecs)
The parallax angle of the star (in arc seconds)
Parallax second :- A star when covering a distance of 1 arc second has equal to the 1 parallax sec(parsec).
1 parsec is equal to the
Light year:- It is important to find the distance. One light year is equal to the distance travelled by light for one year.
1 degree parallax angle is equal to
The sun nearest star distance =
The earth nearest star distance =
The Pluto nearest star distance =
Limitation: If the star has too much distance then parallax angle will become very small to measure and less precise the distance measurement.
Note:
The best way to solve problems of optics is to draw diagrams. This helps in visualizing the problem clearly. You should have a good knowledge of angle and radius. You should have to calculate the angle after six month.
Formula used: Parallax Formula
Here
Complete step by step answer:
Parallax is a method based on measuring two angles and sides of a triangle formed by the star, earth on one side and the other side six month later. Astronomers find the distance of nearby stars in the space by using a parallax method.
First let us draw a diagram to understand the problem better.

Astronomers use an effect to find the distance to a nearby star. Its apparent displacement by comparing the distance of star respect to the earth.
Step-1 See the position of an object (nearby star) once and then again six month later.

Step-2 calculate the change in position by finding the angle of parallax
There is simple relation between star distance and its parallax
Parallax Formula
Here
Parallax second :- A star when covering a distance of 1 arc second has equal to the 1 parallax sec(parsec).
1 parsec is equal to the
Light year:- It is important to find the distance. One light year is equal to the distance travelled by light for one year.
1 degree parallax angle is equal to
The sun nearest star distance =
The earth nearest star distance =
The Pluto nearest star distance =
Limitation: If the star has too much distance then parallax angle will become very small to measure and less precise the distance measurement.
Note:
The best way to solve problems of optics is to draw diagrams. This helps in visualizing the problem clearly. You should have a good knowledge of angle and radius. You should have to calculate the angle after six month.
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