Starship Asterisk*

I agree: All of us misspeak from time to time. If we misspeak as teachers, then we hope that our students will ask clarifying questions, and not merely suffer in confusion and become discouraged. Fortunately, as in the case of the slip of the tongue on right ascension and declination, the assigned W...

During lecture 5, you apparently misspoke when you said, speaking about zenith and horizon, that "if you go up on a hill, it [the horizon] can actually be less than 90 degrees" [from the zenith]. I believe you meant more than 90 degrees. Also, with that triple photo of the position of the ...

I have been addicted to the APOD for a great long while--ever since I took my first astronomy class while living in Albuquerque. Thank you for posting these lectures online--a nice review for me and a nice introduction to astronomy for my children and grandchildren. In your first lecture, I heard yo...