Final answer:
Earth completes approximately 225 million revolutions around the Sun in the time it takes for the Sun to orbit once around the center of the Milky Way galaxy.
Step-by-step explanation:
The student's question asks how many times Earth revolves around the Sun for each revolution of the Sun around the center of the Milky Way galaxy. To answer this, let's consider the solar system's orbit around the Milky Way and Earth's orbit around the Sun.
The Sun takes approximately 225 million years to complete one orbit around the Milky Way. This time is known as a galactic year. On the other hand, Earth revolves around the Sun once every Earth year, which is 365.25 days on average, including leap years.
Therefore, to calculate the number of Earth revolutions around the Sun during one galactic year, we divide the period of the Sun's orbit around the Milky Way (225 million years) by the period of Earth's orbit around the Sun (1 year). 225 million Earth revolutions around the Sun occur during one galactic year.