which formula is used for measuring parallax angle Φ??
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→ The formula in this case is Dp (now the opposite side) divided by Ds (now the adjacent side) equals the tangent of phi (φ). 1. The distance of Earth to the sun (one AU) is very small compared to interstellar distances, so parallax angles are smaller than one arcsecond, which is 1/3600 of a degree.
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