40pc是多少ly？
40pc = 130.4626ly
是130.4626ly，所以说成130ly也没问题——四舍五入的误差在0.5%以内。
反过来，40ly是多少pc？
40ly = 12.2641pc
计算公式: ly = pc × 3.261564
该数值前后的 pc → ly
22 pc71.7544ly
24 pc78.2775ly
26 pc84.8007ly
28 pc91.3238ly
30 pc97.8469ly
32 pc104.37ly
34 pc110.8932ly
36 pc117.4163ly
38 pc123.9394ly
40 pc130.4626ly
42 pc136.9857ly
44 pc143.5088ly
46 pc150.0319ly
48 pc156.5551ly
50 pc163.0782ly
52 pc169.6013ly
54 pc176.1244ly
56 pc182.6476ly
58 pc189.1707ly
60 pc195.6938ly