Measured around the equator, what’s the Earth’s circumference?

Microsoft Rewards Bing Earth Quiz: Measured around the equator, what’s the Earth’s circumference?

A 12,358 miles
B 24,901 miles
C 247,365 miles

The measurement of Earth around the equator is 24,901 miles, plus about a half-mile more. Perhaps that extra bit is from all the bulging caused by centripetal force.

The correct answer is 24,901 miles.

Which of these accurately describes the shape of planet Earth?

Microsoft Rewards Bing Earth Quiz: Which of these accurately describes the shape of planet Earth?

A Bulging sphere
B Dodecagonal
C Jelly bean-like

Due to our planet’s rotation on its axis, centripetal forces push on the North and South poles causing the globe to bulge a little around the equator. That shape is called an oblate spheroid.

The correct answer is Bulging sphere.

How many days does it take Earth to complete one orbit of the sun?

Microsoft Rewards Bing Earth Quiz: How many days does it take Earth to complete one orbit of the sun?

A 365.25
B 365
C πr2

Based on three different models of measuring our solar year, one trip around the sun takes about 365 days…and an extra quarter of a day. That’s why every four years, with a few exceptions, we add an extra day to the calendar and enjoy February 29—Leap Day.

The correct answer is 365.25.