Seasonal Variations of Day and Night
Seasonal Variations of Day and Night
As has been well known since ancient times, a spherical Earth is the simplest geometrical model that quantitatively explains the seasonal variations of day and night at different latitudes. This Demonstration lets you compare the observed paths of the Sun and stars at different latitudes for each day of the year (viewed from the ground) with the spherical Earth model (viewed from space), with quantitative predictions.