What causes the Sun to appear to drift eastward relative to the fixed background stars over a year?

Answer

Earth revolving around the Sun

The apparent movement of the Sun is entirely due to Earth orbiting the Sun, causing the Sun to seem to drift eastward against the background stars over the course of one year.

What causes the Sun to appear to drift eastward relative to the fixed background stars over a year?

#Videos

The Ecliptic: Crash Course Kids #37.2 - YouTube

sunorbitplanetpathecliptic