Term
|
Definition
|
|
Term
|
Definition
the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about September 22 and March 20).
|
|
|
Term
|
Definition
-
the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.
|
|
|
Term
|
Definition
| the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun. |
|
|
Term
|
Definition
a. Orbital motion about a point, especially as distinguished from axial rotation: the planetary revolution about the sun.
|
|
|
Term
|
Definition
| the common center of mass around which two or more bodies revolve |
|
|
Term
|
Definition
| the slow movement of the axis of a spinning body around another axis due to a torque (such as gravitational influence) acting to change the direction of the first axis |
|
|
Term
|
Definition
a periodic variation in the inclination of the axis of a rotating object.
|
|
|
Term
|
Definition
| the action of rotating around an axis or center. |
|
|
Term
|
Definition
the process of growth or increase, typically by the gradual accumulation of additional layers or matter.
|
|
|
