Calculate the sunrise local horizon points, Physics

This problem examines the seasonal solar radiation budget at three geographical locations: the Equator, 40º North, and 80º North.

1356_Calculate the sunrise sunset local horizon points.png

NOTES: At a given geographical location, N, S, E, and W are the north, south, east and west points of the local horizon (also called "cardinal points" different from the same term applied to the precession of the equinoxes discussed in this course), O=observer on Earth, NP=celestial north pole, Z=zenith, X=location of sun at some instant, z=distance XZ to zenith, A=altitude of the sun (Π/2-z), δ=declination of sun DX, which currently varies between ±23.5º throughout the year, α=azimuth of sun; H=hour angle of sun measured from the meridian. During the day, the sun's rays strike the Earth's surface through a series of positive-valued angles A = 0o to a maximum Amax at meridian transit, and back to 0o.  The vertical component, sinA is the "effective heating force." This is also expressed as zenith distance z = 90o-A.  From spherical geometry: cosz = sinθsinδ + cosθcosδcosH. To calculate the total time that the sun is in the sky, set z = 90o (sunrise at the East horizon) to get: cosH = -tanθtanδ. Solve for H and divide by 15o per hour (the Earth rotates 15o per hour) to convert to time for the morning half of the day.  Azimuth angles α of the rising and setting Sun are calculated from the formula: cosα = sinδ/cosθ. 

For the summer and winter solstices, and spring (or fall) equinox of each location:
(A) Calculate the sunrise and sunset local horizon points (+α) in degrees from due North (note: west = negative, east=positive).

(B) Calculate the length of the day in hours, minutes, seconds.

(C) Using the solar constant So=1370 W/m2, calculate the 'effective heating force' that reaches the top of the atmosphere per hour; plot these amounts on a graph of W/m2 vs. hour of the day. What is the summer/winter ratio of total daily insolation at each location? How does the total daily insolation at summer solstice compare among the three locations?

Posted Date: 2/26/2013 1:38:34 AM | Location : United States

Related Discussions:- Calculate the sunrise local horizon points, Assignment Help, Ask Question on Calculate the sunrise local horizon points, Get Answer, Expert's Help, Calculate the sunrise local horizon points Discussions

Write discussion on Calculate the sunrise local horizon points
Your posts are moderated
Related Questions
The mass of an automobile is 1140kg, and the distance between its front and rear axles is2.48 m. The center of gravity of theca is between the front and rear tires, and the horizon

Plastics are polymers, meaning they are made up of molecules from many different elements. By utilizing different combinations, new polymers are made that can be manipulated from m

assignment on micro waves

What is dispersion? Dispersion within optics consider as the change in phase velocity of an electromagnetic wave along with wavelength. Conversely, when there is a variation o

Stefan-Boltzmann constant; sigma (Stefan, L. Boltzmann) The constant of proportionality exist in the Stefan-Boltzmann law. It is equivalent to 5.6697 x 10 -8 W/m 2 /K 4 .


Q.  Derive Schrodinger's time dependent wave equation. What is the physical significance of wave function used in this equation? Ans. Time Dependent Schrodinger's Eq

what is dynamics

what are uncontrollable fission chain reactions complete detail