Somewhat serendipitously, a recent post of mine was moved to the Exhibitions, Conferences, Lectures, Journals forum. As I haven't looked at the posts in that forum, I noticed this post by Hermione announcing a paper by Joachim Quack:

[www.maatforum.com]

In the paper, Quack writes on p65 “Beginning in the New Kingdom and attested still in copies dating from the 2nd century CE, there are examples of linear zigzag functions for defining the length of the day and night in different months of the year (Quack, forthcoming, b)”

Linear zigzag functions are the topic of my paper here: [www.academia.edu]