Question

constellations and equatorial grid begin date: 9/9/2025 12:01:00 am due date: 9/12/2025 11:59:00 pm end date: 9/14/2025
theerathom, kaitlyn grace - ktheera@clemson.edu
problem 12
if the earth goes around the sun, why is the ecliptic not lined up with the celestial equator?
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• the ecliptic is a circle fixed in the sky, but the celestial equator is different for observers at different latitudes.
• the land mass of the earth is more concentrated in the northern hemisphere.
• the earth’s orbit is not a circle but an ellipse.
• the earth’s axis is tilted by about 23 degrees from the vertical.
• the pull of the other planets makes the earth wobble significantly in the course of a year.

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Explanation:

To determine why the ecliptic is not aligned with the celestial equator, we analyze each option:

• The first option is incorrect because the celestial equator is based on Earth's equator (fixed relative to Earth's axis), not observer latitude.
• The second option is incorrect as land mass distribution does not affect the ecliptic - celestial equator alignment.
• The third option is incorrect because the elliptical shape of Earth's orbit relates to distance from the Sun, not the tilt between ecliptic and celestial equator.
• The fourth option is correct: The Earth’s axis is tilted by about 23 degrees from the vertical (relative to the plane of its orbit, the ecliptic). The celestial equator is perpendicular to Earth’s axis, so this tilt creates the angle between the ecliptic (orbital plane) and celestial equator.
• The fifth option is incorrect as planetary pull causes precession (slow wobble over millennia), not significant wobble in a year, and it does not explain the basic tilt - related misalignment.

Answer:

D. The Earth's axis is tilted by about 23 degrees from the vertical.