You can watch an animation of what the sky at would look like at 1pm
throughout the year (m4v). The Sun only seems to pass in front of certain
constellations, so we call these the constellations of the zodiac. Why is the
Sun shifting from constellation to constellation over a year?
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the Earth is orbiting the Sun, so the Sun lines up with different distant
stars of the celestial sphere
the Sun is orbiting the Earth, so the Sun moves in front of different
distant stars of the celestial sphere
the Earth is spinning on its axis, so the Sun and the distant stars of the
celestial sphere appear to rise and set