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New NASA policy
One assignment would be to measure the distance to Alpha Centuri by triangulation and not parallax. Parallax is the perception of distance due to motion. In astronomy, it is frequently done using the annual motion of Earth about the Sun giving annual parallax. But if you do it with the motion of a spacecraft instead of the motion of Earth, it is still called parallax. Alain Fournier I do GeT confused easily. But stellar parallax is a relative angle to background stars? In my view an angle-side-angle triangulation measure computes the distance. Not a relative angle to the background stars. A parallax baseline as the two points in a sun orbit with a known length and the angle of parallax appears relative to the unknown distance to the background stars. So the field of cosmological stars is a simple progression without a firm initial value. |
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