Understanding the Conversion

* Astronomical Unit (AU): The average distance between the Earth and the Sun. 1 AU is approximately 149.6 million kilometers (93 million miles).

Calculation

1. Convert to kilometers: 2.27 billion km = 2,270,000,000 km

2. Divide by the value of 1 AU: 2,270,000,000 km / 149,600,000 km/AU = 15.17 AU (approximately)

Therefore, 2.27 billion kilometers is approximately 15.17 astronomical units.