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author | Adrian Kummerlaender | 2020-01-20 22:40:44 +0100 |
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committer | Adrian Kummerlaender | 2020-01-20 22:40:44 +0100 |
commit | abbdbe64d12af732983bc11aac772d3d32682bb5 (patch) | |
tree | fb89bd9818e33588cf295036c6feb681b92d0ff4 /sun.py | |
parent | b0b52925fb96e417802f4b390fafc15c8536df2d (diff) | |
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Extract OpenCL setup into Renderer
Diffstat (limited to 'sun.py')
-rw-r--r-- | sun.py | 32 |
1 files changed, 0 insertions, 32 deletions
@@ -1,32 +0,0 @@ -import numpy as np -from datetime import datetime - -## Sun direction depending on time and place -# As described in Appendix D of "ME 4131 Thermal Environmental Engineering Laboratory Manual" - -def sun_declination(time): - day_of_year = time.timetuple().tm_yday - return 23.45 * np.sin(np.radians((360/365)*(284+day_of_year))) - -def equation_of_time(time): - day_of_year = time.timetuple().tm_yday - b = np.radians(360*(day_of_year-81)/364) - return 0.165*np.sin(2*b) - 0.126*np.cos(b) - 0.025*np.sin(b) - -def sun_direction(lat, lon, time, time_diff, summertime_shift = 0): - lon_std = time_diff * 15 - clock_time = time.hour + time.minute/60 - local_solar_time = clock_time + (1/15)*(lon - lon_std) + equation_of_time(time) - summertime_shift - hour_angle = 15*(local_solar_time - 12) - - l = np.radians(lat) - h = np.radians(hour_angle) - d = np.radians(sun_declination(time)) - - altitude = np.arcsin(np.cos(l) * np.cos(h) * np.cos(d) + np.sin(l) * np.sin(d)) - azimuth = np.arccos((np.cos(d) * np.sin(l) * np.cos(h) - np.sin(d) * np.cos(l)) / np.cos(altitude)) - - if h < 0: - return (altitude, azimuth) - else: - return (altitude, -azimuth) |