Question

why did scientists struggle for thousands of years to accurately describe the solar system?
venus has phases like the moon.
many people spoke italian and did not understand latin.
the planets appeared to move backward in the sky occasionally.
scientists could not explain why the sun appeared to rise and set every day.

Explanation:

Step1: Analyze each option

• Venus having phases like the moon was discovered later and wasn't the main long - standing struggle.
• Language (Italian and Latin) has no relation to describing the solar system accurately.
• The apparent retrograde motion of planets (planets appearing to move backward in the sky occasionally) was a major observation that was hard to explain in early models (like the geocentric model) and was a long - standing problem.
• The Sun's apparent rise and set is due to Earth's rotation, but this was not the key factor in the long - term struggle to describe the solar system accurately.

Answer:

The planets appeared to move backward in the sky occasionally.