[OU.03] What is the best method to increase the accuracy of the parallax measurement of star distances?

Trigonometric or Stellar Parallax

Explanation:

Whenever a star is too far away to measure its parallax, astronomers do match its color and spectrum to one of the standard candles and determine its intrinsic brightness.

Comparing this to its apparent brightness, they can get a good measure of its distance by applying the 1/r^2 rule.

Astronomers estimate the distance  of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. They measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.

b.a device that inputs heat into a cool object

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west