In today's image, we see a page of astronomy lecture notes dating back to 1490. The upper diagrams show the explanation of the occurrence of eclipses under the Ptolemaic model of the universe. At the bottom are a model of the geocentric universe, and a calendar to calculated the date of Easter Sunday in the Julian Calendar.

My podcasts are available in video form through this YouTube Channel.

This Podcast is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: Astronomy Picture of the Day. You can use the archive link below the image to select the photo corresponding to the date of this podcast.

I welcome comments and suggestions about these podcasts. I can be reached here: wagnerastronomy@gmail.com

This work is licensed under a Creative Commons Attribution 4.0 International License.