Mathoastronmusicaology

This evening as I was getting off the train, I started thinking about the rate of change of the sunrise and sunset times -- prompted by the fact that it seems to be noticeably darker this week when I get home than last week (and much darker than the week before).

As I was walking to the car, I was struck by the realization that the title of a song that a 1973 Helen Ready hit that my iPod had dug up earlier in the day would also be the correct description of one of the values I was pondering
( In case want to guess, or not groan )