GEO 211 1st Edition Lecture 10 Outline of Last Lecture I. Solar Particles and AuroraII. Chapter 3- Earth and Sun RelationshipsA. Why do we have seasons?B. Physical factors causing seasonal variations1. Earth’s revolution2. Earth’s rotation3. Earth’s angle of inclination4. Earth’s axis orientation5. Earth’s sphericityC. Earth’s revolutiona. Perihelonb. TaphelionD. Earth’s rotationE. Earth’s angle of inclinationF. Earth’s axis orientationG. Earth’s sphericitya. PolarisH. Solstice ConditionsOutline of Current Lecture II. Air and Temperature Data continuedA. Estimating energy needs:a. Heating degree daysb. Cooling degree daysc. Growing degree days Current LectureII. Air and Temperature Data continuedA. Estimating energy needs:a. Heating degree days- used to evaluate energy demands and consumption These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.costs- Calculated in winter months- Calculated in winter months- Assume bas temperature is 65°F- 1 heating degree day equals to each degree the average daily temperature is below 65°F- Subtracting daily mean from the base value of 65°F- Ex: daily mean of 40°F has 25 heating degree days (65-40=25)b. Cooling degree days- calculated in summer- 1 cooling degree day is 1° above the base value - Ex: a day with daily mean at 85°F represents 20 CDDs (85-65=20)c. Growing degree days -Used to determine approximate date when crops are ready for harvest-Base value temperature vary from crop to crop-Ex: sweet corn= 50°F, peas= 40°F. If the daily mean is 75°F, GDD for sweet corn is 25, peas it is
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