Apparent Annual Motion Of The

The apparent easterly motion of the Sun among the stars is caused by the real revolution of Earth around the Sun. The Sun seems to move in a full circle around the celestial sphere every year.

Figure 1.10. The Sun's apparent annual motion around the celestial sphere results from Earth's real motion around the Sun. As Earth orbits the Sun, different constellations of the zodiac appear in the night sky.

About how far does the Sun move on the ecliptic every day? Tip: Use the fact that the Sun moves 360° around the ecliptic in a year (about 365 days).

365 days

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