Seasons Direct result of inclination & parallelism in orbit distribute energy from vertical to oblique rays tilt spreads concentration of energy over broader area

Solstices

Equinox

• Arctic Circle
  
  
  

• Tropics (Cancer & Capricorn)
  
  
  

• A diagram to show where sun is directly overhead on specific date
• sextant measurement and location of where the sun is directly overhead
  • can determine exact latitude
• in class exercise
  

• Term for incoming solar radiation
  • main source of energy
• surplus within tropics (thermodynamic - hot to cold)
• deficit amounts closer to poles