A mean sun is used as the reference for...

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Question 1 of 2066636ee928f7522a1c519bcc

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?

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Question 1 of 20

66636ee928f7522a1c519bcc

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?

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🔍 Key Concepts

• Apparent sun vs. mean sun and why a fictitious "mean" sun is defined • Causes of variation in the apparent solar day: Earth's elliptical orbit and axial tilt • Why time is defined relative to the celestial equator instead of the ecliptic when constructing mean solar time

💭 Think About

• Ask yourself: Which option is not a reason we need to invent a mean sun, but rather describes how we measure time or where the sun appears to move? • Think about which choices are related to changes in the length of the solar day versus choices that just describe geometry or reference planes in the sky. • Identify which items cause the apparent sun to move unevenly along the observer’s hour angle, and which item would remain true even if the apparent motion were perfectly uniform.

✅ Before You Answer

• For each choice, decide: Does this directly cause the apparent solar day to vary in length from one day to the next? • Remember that the mean sun is an imaginary body that moves uniformly along the celestial equator, not the ecliptic—check which statement reflects this. • Verify which option describes a property of our timekeeping system (how we define or measure time) rather than a physical cause of the apparent sun’s irregular motion.

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Question 1 of 2066636ee928f7522a1c519bcc

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?

Back

Question 1 of 20

66636ee928f7522a1c519bcc

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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