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