The quote could have been clearer wrt the reference hemisphere for the stated seasons. However, it is a well-known fact that the Earth's orbit is not perfectly circular and that the distance between Sol and the Earth varies continuously; though I'm not an astrophysicist I may speculate that there may be a very slight change in Earth's rotational speed associated with these orbital mechanics.
"If you can't take a little bloody nose, maybe you ought to go back home and crawl under your bed. It's not safe out here. It's wonderous, with treasures to satiate desires both subtle and gross... but it's not for the timid." Q, Q Who