| He was measuring the stars' radial velocity, | เขากำลังคำนวณวิถีโคจรของดวงดาว ระยะทาง Parsecs Self Made Man (2008) |
| radial velocity | (n) velocity along the line of sight toward or away from the observer |
| 視線速度 | [しせんそくど, shisensokudo] (n) radial velocity; line-of-sight velocity [Add to Longdo] |