This is the reverse side of Willem Janszoon Blaeu’s Nova totius terrarum orbis geographica ac hydrographica tabula (Amsterdam 1606) which I used in my recent creation A New & Arabesque Map of the Hirshhorn Museum. If you look closely, you can see the reverse of original map that bled through the paper after couple hundred years and some image manipulation. The table shown is similar to an Ephemeris, which is table of values that gives the positions of astronomical objects in the sky at a given time. I would love for someone to sit and explain the way one goes about reading these types of antique charts. I understand a fair amount of what is being shown, but I do not fully grasp how to apply the calculations.