We're returning to our Guess the Manuscript roots (which stretch all the way back to April of this year) for this latest instalment of everyone's favourite game: it's a diagram!

Same rules as always: the manuscript this comes from is part of the British Library collections and can be found somewhere on our Digitised Manuscripts site. Extra points if you can tell us what kind of diagram this is - good luck!

You can see previous examples of these puzzles here, and as always, you can leave a guess in the comments below, or contact us on Twitter @BLMedieval.

Update:  This diagram is from Arundel MS 501, a miscellany put together from a number of different codices that range in date from the 11th to the 16th century and produced in Germany.  Congratulations to @melibeus1, who solved this with impressive speed, and provided the following description: 'Diagram, at the end of an explanation to the Tables for finding the moveable feasts, the age of the moon, the golden number and the hour of the new moon.' Well done!