En simpel model af systemet med Jorden og Solen. Modellen demonstrer dagens og årets variationer.

1. You can select a latitude by moving the blue point.[br]2. Go through the year by moving the blue slider.[br]3. Go through the day by moving the black slider.[br][br]Key questions and terms:[br]1. Solstices - when is the longest/shortest day of the year where you live? How long is it?[br]2. Difference between northern and southern hemisphere.[br]3. Tropic of cancer, Tropic of capricon.[br]4. Arctic and Antarctic circles - What happens around northern and southern poles around the solstices?[br]5. How long are the days in the equator.[br]6. How does a sundial work? - How can you determine at what time of the day/year a picture was taken?[br]7. Where should solar panels point?