Password-Protected Teaching Notes

To ensure the integrity of the activity, hyperlinks to some teaching notes will be password-protected effective 1 November 1998. Teachers may obtain the username and password required to access these valuable teaching notes by sending e-mail to Walter Sanford, co-author. Please do not share the password with students.

Mr. Walter Sanford, Director
Sandburg Center for Sky Awareness
Sandburg Planetarium
Carl Sandburg Middle School
8428 Fort Hunt Road
Alexandria, VA 22308
E-Mail: wsanford@wsanford.com