Here's a handy boy (or grrrl) to while away the time. It'll show you - in graphic form and overlayed onto a map - the hours of daylight, sun position and much much more. You can set it to any date, and anywhere you choose. Also gives you a surpisingly detailed weather forecast.

Want to take a look at current, past or future data for Tierro del Fuego, Reykjavik, Thurso or Drumnadrochit, anyone? Go right ahead.

I've set this link so that it'll open in the midst of The Unmentionable Mountains on May 17 2016. But you change this any way you choose.Click right here for hours of fun!

Nice one, Humphrey.

Hours of fun! Thank you. :)

This is quite an old app. It was first used by our ancestors in the Neolithic period to align and illuminate passage grave monuments in places like Newgrange and Maeshowe on the Winter solstice. It's very handy for pitching your tent to ensure you are woken by the first rays of Scottish sun.