- #1

alemsalem

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is it by observing the star from the same point in two different years and then subtracting off this effect?

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In summary, determining the distance to a star using its angle does not require knowledge of its motion. Instead, the difference in position from observing the star from the same point in two different years provides the angle, and the diameter of Earth's orbit serves as a measuring stick. For stars that do have significant motion, the proper motion can be calculated and corrected for in the parallax measurement.

- #1

alemsalem

- 175

- 5

is it by observing the star from the same point in two different years and then subtracting off this effect?

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- #2

russ_watters

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Try drawing a diagram.

- #3

Drakkith

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- #4

Chronos

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- #5

pmacias

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Yes, measuring the distance to stars using parallax involves observing the star from two different points on Earth's orbit around the Sun, which are approximately six months apart. This creates a baseline for measuring the parallax angle, which is the apparent shift in the star's position relative to more distant stars. By measuring this angle and knowing the baseline distance between the two observation points, we can use trigonometry to calculate the distance to the star.

The motion of the star itself does not need to be known in order to determine its distance using parallax. However, it is important to take into account any potential sources of error, such as the motion of the Earth's atmosphere, when making these measurements. This can be done by observing the star multiple times and averaging the measurements to minimize the effects of atmospheric distortion.

In summary, measuring the distance to stars using parallax is a reliable method that utilizes the principles of trigonometry and careful observation to accurately determine the distance to stars, even without knowing their motion.

Parallax is the apparent shift in an object's position when viewed from different vantage points. By measuring the parallax angle of a star from two different locations on Earth, we can calculate its distance using basic trigonometry.

The baseline is the distance between the two points of observation on Earth. The larger the baseline, the more accurate the measurement will be. In the case of measuring the distance to stars, the baseline is the distance between the two observation points on opposite sides of the Earth's orbit around the Sun.

A parsec is a unit of measurement used for astronomical distances, equal to 3.26 light years or 3.086 × 10^13 kilometers. It is derived from the parallax angle of one arcsecond, which is the angle formed by an object at a distance of one astronomical unit (AU) when viewed from two points 1 AU apart. Therefore, the larger the parallax angle, the smaller the distance in parsecs.

No, parallax can only be used to measure the distance to stars within a certain range. For stars that are too far away, the parallax angle becomes too small to accurately measure. Currently, parallax measurements are only reliable for stars within a distance of about 1000 light years.

Parallax measurements are generally very accurate for stars within the range of 1000 light years. However, the accuracy can vary depending on the precision of the instruments used and the distance of the star. For nearby stars, the margin of error can be as small as a few percent, while for more distant stars, the margin of error can be larger.

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