Wind & Solar Energy ESET 222: Solar Position Calculation
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Questions and Answers

What is the hour angle?

  • The number of degrees between the local meridian and the sun's meridian (correct)
  • The azimuth angle of the sun
  • The number of degrees between the sun and the moon
  • The altitude angle of the sun

    • When does the hour angle have positive values?

  • In the morning before the sun crosses the local meridian (correct)
  • At midnight
  • At solar noon
  • In the afternoon

    • What does a positive azimuth angle indicate?

  • Sun at solar noon
  • Sun in the west in the afternoon
  • Sun in the east in the morning (correct)
  • Sun at midnight

    • At 2:00 P.M. solar time, what would the hour angle be?

    <p>-30 degrees</p> Signup and view all the answers

    Which angle helps us remember that it is specifically related to the sun's position?

    <p>Azimuth angle</p> Signup and view all the answers

    How is the azimuth angle conventionally defined in terms of sun's position?

    <p>Positive in the morning with sun in the east</p> Signup and view all the answers

    What describes the location of the sun at any time of day?

    <p>Hour angle and azimuth angle</p> Signup and view all the answers

    What factors determine the azimuth and altitude angles of the sun?

    <p>Latitude, time of day, and solar declination</p> Signup and view all the answers

    In the provided example, what was the solar declination on the summer solstice?

    <p>23.45°</p> Signup and view all the answers

    How many hours after solar noon was it at 3:00 P.M. in the provided example?

    <p>3 hours</p> Signup and view all the answers

    What is the formula used to calculate the altitude angle in the provided example?

    <p>$ sin β = cosL cosδ cosH + sinL sin δ $</p> Signup and view all the answers

    What is the calculated altitude angle for the sun in the provided example?

    <p>47.73°</p> Signup and view all the answers

    How is the azimuth angle calculated in the provided example?

    <p>$ φS = sin^{-1}(-0.9644) $</p> Signup and view all the answers

    What does a negative azimuth angle indicate in relation to south?

    <p>$75°$ west of south</p> Signup and view all the answers

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