| Answer | Crossword Clue |
|---|---|
| PARALLAX | Apparent displacement due to observer movement |
| parallax | the apparent displacement of an observed object due to a change in the position of the observer. |
| aberrations | The apparent displacement of a celestial object from its true position, caused by the relative motion of the observer and the object |
| aberration | The apparent displacement of a celestial object from its true position, caused by the relative motion of the observer and the object |
