| use parallax | 0.31 |
| remain constant | 0.29 |
| vary to aphelion | 0.27 |
| travel at speed | 0.27 |
| calculate the length of… | 0.25 |
| separate the earth | 0.25 |
| follow regular pattern | 0.25 |
| double in another 9.8 b… | 0.25 |
| recalculated | 0.68 |
| calculated | 0.59 |
| measured | 0.50 |
| measured in light years | 0.42 |
| measured in degree | 0.41 |
| determined | 0.37 |
| travelled by light | 0.35 |
| inferred | 0.31 |
| covered | 0.30 |
| difficult to determine | 0.30 |
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