 |
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
|
|
parallactic displacement
The apparent change in a star’s position caused by the movement of Earth in its orbit; also known as parallactic motion. Over the course of a year, a star appears to follow a small path in the sky called a parallactic ellipse, or a parallactic orbit, the shape of which ranges from a circle for a star at the ecliptic pole to a line for a star on the ecliptic.
Related category
• CELESTIAL MECHANICS
Also on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History
Transport Concepts & Designs (partner site)