I’ve noticed that The Register is going full steam ahead in marking the 50th anniversary with a series of readable posts (eg the one on Punishment Gluttons). I won’t mention them all but this is one that I would suggest is worth a look at. Titled GALACTIC YO-YO: Doctor Who’s trips to Earth… and beyond it gives us another infographic from Time & Space Visualiser: The Story and History of Doctor Who as Data Visualisations by Paul Smith, published by Wonderful Books. What is it about? Read on…
The Galactic YoYo
This deceptively simple picture tracks how much time the Doctor spends on Earth rather than not. It uses a really basic algorithm (explained in the article) and it first you might think so what? Take another look (if you click the picture should expand - if not buy the book!) and you will see a lot more is going on. Received wisdom gets challenged - yes the Third Doctor was stuck on Earth but the trend started most markedly with the Second Doctor. There’s also lots to consider for later Doctors.
I think it’s worth a look - do let me know what you think

