That said, I do offer the web documents and my line drawings and my photographs to the net as a resource in astronomy education. Feel free to use the web documents and (Strobel) original art in your own astronomy courses or talks. If you decide to make copies of these web documents on your web server, please observe all of the following rules:
<center><h4>This page was copied from <a href="https://www.astronomynotes.com">Nick Strobel's Astronomy Notes</a>. Go to his site at <a href="https://www.astronomynotes.com">www.astronomynotes.com</a> for the updated and corrected version.</h4></center>
If you make hardcopies of these web documents or use any parts therein created by me including line drawings or my other original art in hardcopy or electronic format, you must clearly and explicitly acknowledge my authorship of the text and the images I created. Also, show how to get to my web site at www.astronomynotes.com. For images, something like "This image is courtesy of Nick Strobel at www.astronomynotes.com" is sufficient. If you use the image on your website, send me the link to your website. If you use the image in a physical work you are creating such as a book, pamphlet, music album, paper, play, etc., I request that you send me a copy of the work when it is finished as "payment" for using the image.
Copyrighted, 1998 - 2020 [or current year] by Nick Strobel