Plot position of Sun relative to stars, over one full
year.
Similar to what we have been doing with moon
Complicated by fact you cant see Sun and stars at
same time.
Once you have full map of sky, you can work this out
by seeing what
stars are opposite sun 12 hours later.
Path of sun around the celestial sphere is called the ECLIPTIC
Set of constellations through which it passes is called the ZODIAC