Page 11 - Spec Tech Vol 1 Issue 06

Space Terms to know about

Libration:

In lunar astronomy, libration is

the wagging or wavering of the

Moon perceived by
Earth-bound observers and

caused by changes in their
perspective. It permits an

observer to see slightly

different hemispheres of the
surface at different times.

Sundogs:

Sun dog, also called mock
sun or parhelion, atmospheric optical
phenomenon appearing in the sky

as luminous spots 22° on each side of
the Sun and at the same elevation as
the Sun. Usually, the edges closest to
the Sun will appear reddish. Other
colours are occasionally visible, but
more often the outer portions of each
spot appear whitish.

Heliosphere:

The heliosphere is the

sun’s extended atmosphere

that surrounds the entire
solar system. It is a vast,

bubble-like region of space
which surrounds and is

created by the Sun.

Space Explorer 2022 11