| NATS 101 Intro to Weather and Climate Lecture 7 Seasonality |
| Supplemental References for TodayÕs Lecture |
| Reasons for Seasons |
| Eccentricity of Orbit |
| Slide 5 |
| Solar Zenith Angle |
| Beam Spreading |
| Beam Spreading |
| Atmospheric Path Length |
| Length of Day |
| Day Hours at Solstices - US Sites |
| Path of Sun |
| Noon Zenith at Solstices |
| Incoming Solar Radiation
(Insolation) at the Top of the Atmosphere |
| Is Longest Day the Hottest Day? |
| Annual Energy Balance |
| Summary |
| Assignment for Lecture |