In the sense he stated the seasons, he is correct. I did not however explain the "striaght" axis event that occurs every 6 months. Every March & September the earth is in opposite sides of it's orbit. The earth is tilted at 23.5 degrees and "wobbles" spins. In the winter Dec 20-22 in the northern hemisphere, the earth is tilted away from the sun, hence the low sun in the sky and shorter days. The complete opposite in summer. However during our winter, it is summer in Austrialia. The south pole is closer to the sun. During spring and fall the earth is indeed still tilted (I erred here in not explaining better) But is 90 degrees pertindicular with the equator. My apologies in not explaining better. My typing is quicker than my thought processes it seems. I hope that helped some.