How do astronomers measure the distance to a nearby star

astronomers can measure a star's position once, and then again 6 months later and calculate the apparent change in position. the star's apparent motion is called stellar parallax. the distance d is measured in parsecs and the parallax angle p is measured in arcseconds.                                                                                              

hope this : p

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this