Within this use case you learn about the constellations of the
Zodiac, i.e. those crossed by the apparent path of the Sun during the
year. Together with some characteristics the orbital motion of the
Earth, in this use case you also find a short excursion into history
of astronomy. The use case also introduces the precession of the
equinoxes.
The Earth rotates around its polar axis and orbits around the Sun:
the sky above us (the celestial sphere) is in constant apparent
motion. Stellarium is the perfect tool to demonstrate the motions of
the sky, the use of coordinates and to illustrate constellations.
