Thanks to a great homeschool friend ;-) we are taking part of this investigation!
I only found out about it last night, but this morning Fairy and I were busy making our 11 charts to chart our local sunrise and sunset. On Friday, we will start charting the 10 other mystery locations' photoperiods. At the end of the 11 weeks, we will try to find out where the 10 locations are, using the photoperiods and longitude clues. It should quite interesting!
You can find a lot of information looking through the Journey North site. Fairy and I watched a couple of the slide shows, the World's Biggest Address Book (about longitude and latitude) and The Sun's Daily Cycle. There are forms to use for graphs, data collecting sheets, etc... This happens every year and it is very well organized!