The annosphere is a tabletop model, designed in the style of a 19th century scientific instrument, that demonstrates the planet's daily and seasonal changes in sunlight.
With the annosphere, you can see why our days are long in the summer and short in the winter. The annosphere can be adjusted to show the changing sunlight everywhere from the north pole, where a day lasts for six months, to the equator, where day and night are equal throughout the year.
The annosphere is also a timepiece, like a sundial, telling time with a moving shadow . Unlike a sundial, the annosphere can be speeded up, showing a day's changes in sunlight in just four minutes.