Page 11 - Spec Tech Vol 1 Issue 08
P. 11
Space Terms to know about
Perihelion:
Perihelion is a point in the orbit
of a body circling the sun that is
closest to the star. The word
comes from Greek and literally
means around (peri) the sun
(helios). Aphelion is the point at
which an orbiting body is
furthest from the sun.
Ring:
A ring system is a disc or
ring, orbiting an astronomical
object, that is composed of
solid material such
as dust and moonlets, and is
a common component
of satellite systems around
giant planets. A ring system
around a planet is also known
as a planetary ring system.
Sidereal Day :
The sidereal day is the time it
takes for the Earth to complete
one rotation about its axis with
respect to the ‘fixed’ stars. By
fixed, we mean that we treat the
stars as if they were attached to
an imaginary celestial sphere at
a very large distance from the
Earth.
Space Explorer 2022 11
