I have been missing for a long time.
Last year I was busy writing and defending a dissertation. Then I got a new job. I’ve moved, had a baby and started a new career in the span of six months. Hopefully you understand my absence.
However, the long neglect of ilovephysics.com is officially over. I am starting a new column called “Ask a Physicsist.” Click on the graphic at the top of the page to learn more. Essentially, I’m going to start answering your emails! I get several a week from Physics Phans and crackpots and others, and I thought I would make my responses a little more … ummm … well … I’m actually going to start responding. However, I’m going to respond via this public forum so that everyone can benefit from my wisdom ;).
Also, two students will be coming on board as contributors to this site. I’m kind of forcing them to contribute, since I control their grade!
Donny will be blogging about the STM project that he is working on. And Andy will begin blogging about a vacuum sputtering system that he will be building this semester. Look for their contributions in the next week or so.
So I’m back. Let’s hope I’m better at finding time to write this semester.

Christopher who?
I know you’ve missed me, Martin.
Next step, getting the forum back under control. I’m a little scared to go in there!
Earth’s rotation around its own tilted axis is about 700 mph. If we consider a specific city, say LA, then it is spinning at 700 mph. How is it that LA has the 4 distinct seasons, since it is spinning around; I understand that in Winter the sun’s rays strike the earth more obliquely because of the tilt of the axis relative to the plane in which we orbit the sun. Doesn’t this spinning on its own axis (say LA) cancels out its the 4 seasons?
Thanks!