Astronomy Fun Fact #45
Earth's orbit isn't perfectly round, it's an ellipse. So when people say the Earth is 93 million miles away from the Sun, that's just an average. In reality, there are parts of the year where the Earth is only 91 million miles away from the Sun and there are times when we're 94 million miles away.
But that difference of 3 million miles isn't enough to change the temperature of the Earth by very much, so it's not responsible for Earth's seasons. We can thank our planet's 23 degree tilt for that.