Calculate zenith angle using a loop

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ABDALLAH BOINA Safinati-Amir
ABDALLAH BOINA Safinati-Amir 2020 年 5 月 4 日
回答済み: ag 2025 年 4 月 4 日
Hi, i am actually trying to calculate zenith angle with the spa code. I have databases for 24h. I would like to calculate the angle for each time step using a loop but i don't know how to do it. Also i would like to know if the elevation and slope have to change. Can someone help me? Thanks

回答 (1 件)

ag
ag 2025 年 4 月 4 日
Hi Abdallah,
To calculate the zenith angle using the Solar Position and Algorithm (SPA) for each time step in a 24-hour period, you'll need to loop through each time step, input the necessary parameters into the SPA function, and store the results.
Below is a self explanatory code snippet on how to achieve this:
% Define constants, latitude, longitude, elevation, slope, timezone
time_steps = 0:1/24:23/24; % 24-hour period with hourly steps
% Array for zenith angles
zenith_angles = zeros(length(time_steps), 1);
% Loop over each time step
for i = 1:length(time_steps)
% Get current time step
current_time = time_steps(i);
% Calculate date and time components
hour = floor(current_time * 24);
minute = mod(current_time * 1440, 60);
second = 0;
% Call SPA function (assuming you have a function 'spa_calculate')
spa_results = spa_calculate(year, month, day, hour, minute, second, ...
latitude, longitude, elevation, slope, timezone);
% Extract zenith angle from results
zenith_angles(i) = spa_results.zenith;
end
Hope this helps!

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