The tropical year differs from which year by...

🔍 Key Concepts

• Tropical year – based on the cycle of seasons and the Sun’s apparent passage from one vernal equinox to the next • Sidereal year – based on Earth’s orbit relative to the fixed stars, not the equinox • Difference in length: which two ‘years’ are closest, differing by only about 20 minutes?

💭 Think About

• First, recall what each option means: which one is measured against the stars, which against the Sun and seasons, and which are just other names for the same thing? • Ask yourself: the tropical year is tied to the equinoxes and the seasons. Which other ‘year’ type is slightly longer because it ignores the slow shift of the equinox (precession)? • Eliminate any choices that are just alternative names for the tropical year itself—those would not differ by 20 minutes.

✅ Before You Answer

• Verify which ‘year’ is defined as the time it takes Earth to return to the same position relative to the fixed stars • Check which terms are effectively synonyms: is an equinoctial year another name for the tropical year, or something else? • Confirm which pair has a known difference of roughly 20 minutes in length, with the star‑based year being slightly longer.

The tropical year differs from which year by 20 minutes?

Astronomical year

Sidereal year

Equinoctial year

Natural year