Continue inplementation of basic algorithm

Author: langestefan

data/meta.json

@@ -2,11 +2,23 @@
     "spa-test-data-1": {
         "latitude": 39.743,
         "longitude": -105.178,
+        "altitude": 1829.0,
         "timezone": "UTC-7",
         "name": "NREL",
         "pressure": 835.8,
         "temperature": 10.0,
         "dUT1": 0.0,
         "dTT": 64.797
+    },
+    "spa-test-data-2": {
+        "latitude": 52.3581,
+        "longitude": 4.88119,
+        "altitude": 0.0,
+        "timezone": "UTC+1",
+        "name": "van-gogh-museum",
+        "pressure": 1005,
+        "temperature": 15.0,
+        "dUT1": 0.0,
+        "dTT": 64.797
     }
 }

data/spa-test-data-1.csv

@@ -0,0 +1,122 @@
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+6/5/2024,13:00:00,29.990354,189.688102,9.688102,74.056320,22.629294,5.230189,22.628107,74.056175,5.230335,1.399193
+6/5/2024,14:00:00,33.514344,215.298522,35.298522,74.099293,22.633648,20.228287,22.632429,74.098741,20.228839,1.391584
+6/5/2024,15:00:00,40.059259,235.790059,55.790059,74.142267,22.637991,35.226383,22.636703,74.141347,35.227304,1.383967
+6/5/2024,16:00:00,48.265598,251.855971,71.855971,74.185244,22.642323,50.224476,22.640934,74.184017,50.225703,1.376340
+6/5/2024,17:00:00,57.216542,265.149160,85.149160,74.228223,22.646643,65.222567,22.645129,74.226774,65.224016,1.368704
+6/5/2024,18:00:00,66.343188,276.963299,96.963299,74.271205,22.650951,80.220656,22.649296,74.269631,80.222229,1.361059
+6/5/2024,19:00:00,75.241064,288.174855,108.174855,74.314188,22.655248,95.218742,22.653446,74.312599,95.220332,1.353405
+6/5/2024,20:00:00,83.536356,299.392994,119.392994,74.357174,22.659534,110.216826,22.657587,74.355676,110.218325,1.345742
+6/5/2024,21:00:00,91.140455,311.056996,131.056996,74.400163,22.663808,125.214909,22.661729,74.398858,125.216213,1.338070
+6/5/2024,22:00:00,97.349270,323.459529,143.459529,74.443153,22.668070,140.212988,22.665883,74.442131,140.214010,1.330389
+6/5/2024,23:00:00,101.912738,336.709766,156.709766,74.486146,22.672321,155.211066,22.670055,74.485476,155.211735,1.322699
+

data/spa-test-data-2.csv

@@ -28,54 +28,69 @@ struct BasicAlgorithm <: SolarPositionAlgorithm
     location::Location
 end
 
-function PositionInterface.sunpos(algorithm::BasicAlgorithm, timestamp::ZonedDateTime)
+""" Calculate the solar position vector (zenith, azimuth) using the basic algorithm.
 
-    # declination [deg]
-    β = declination(timestamp)
+The basic algorithm is based on the reference implementation by Sandia PVPMC [1]. Some 
+of the equations are obtained from NREL's SPA algorithm [2] and the Wikipedia page on 
+computing solar zenith angles [3] and solar azimuth angles [4].
 
-    # Longitude of the standard Time Merdidian [deg]
-    λ_LSTM = 15 * offset_hours(timestamp)us"deg"
+# References
+
+- **[1]** Sandia PVPMC. Basic Solar Position Models. URL: https://pvpmc.sandia.gov/modeling-guide/1-weather-design-inputs/sun-position/basic-solar-position-models/
+- **[2]** NREL. Solar Position Algorithm for Solar Radiation Applications. URL: https://www.nrel.gov/docs/fy08osti/34302.pdf
+- **[3]** Wikipedia. Solar zenith angle. URL: https://en.wikipedia.org/wiki/Solar_zenith_angle
+- **[4]** Wikipedia. Solar azimuth angle. URL: https://en.wikipedia.org/wiki/Solar_azimuth_angle
+"""
+function PositionInterface.sunpos(algorithm::BasicAlgorithm, timestamp::ZonedDateTime)
+
+    # collect location-agnostic quantities
+    β = declination(timestamp) # declination [deg]
 
     # Local longitude  / latitude [deg]
-    λ_local = algorithm.location.longitude
     ϕ_local = algorithm.location.latitude
 
-    # Local time, without daylights saving time [h]
-    T_local = fractional_hour(standard_time(timestamp)) * us"h"
+    # hour angle [deg]
+    HRA = hour_angle(timestamp, algorithm.location)
+
+    # solar zenith angle [deg]
+    θ_z = acosd(sind(ϕ_local.value) * sind(β.value) +
+                cosd(ϕ_local.value) * cosd(β.value) * cosd(HRA.value))
 
+    # solar azimuth angle [deg]
+    # θ_a is measured westward from south
+    θ_a = atand(sind(HRA.value),
+        cosd(HRA.value) * sind(ϕ_local.value) - tand(β.value) * cosd(ϕ_local.value))
+
+    # apply correction θ_a to the range [0 to 360]
+    # atand(x,y) outputs values in the range [-180, 180], so we have to apply a correction
+    if θ_a < 0
+        θ_a *= -1
+    else
+        θ_a = 360 - θ_a
+    end
+
+    return (
+        Quantity(θ_z, SymbolicDimensions, deg = 1),
+        Quantity(θ_a, SymbolicDimensions, deg = 1))
+end
+
+function hour_angle(timestamp::ZonedDateTime, location::Location)
     # equation of time from [deg] to [h], 360 deg = 24 h
     E_qt = equation_of_time(timestamp) * 24us"h" / 360us"deg"
-    println("Timestamp: ", timestamp)
-    println("E_qt: ", E_qt * 60us"min/h")
-    println("T_local: ", T_local)
-    println("λ_LSTM: ", λ_LSTM)
-    println("λ_local: ", λ_local)
-    println("ϕ_local: ", ϕ_local)
-    println("β: ", β)
+
+    # Longitude of the standard Time Merdidian [deg]
+    λ_LSTM = 15 * offset_hours(timestamp).value * us"deg"
+
+    # local standard time [h]
+    T_local = fractional_hour(standard_time(timestamp)) * us"h"
+    λ_local = location.longitude
 
     # solar time [h]
     T_solar = T_local + E_qt + (λ_LSTM - λ_local) / 15us"deg/h"
-    println("T_solar: ", T_solar)
 
     # hour angle [deg]
-    H = 15us"deg/h" * (12us"h" - T_solar)
-    println("H: ", H)
-
-    return (
-        Quantity(0.0, SymbolicDimensions, deg = 1),
-        Quantity(0.0, SymbolicDimensions, deg = 1))
-
-    # # solar zenith angle [deg]
-    # θ_z = acosd(sind(ϕ_local.value) * sind(β.value) +
-    #             cosd(ϕ_local.value) * cosd(β.value) * cosd(H.value))
-    # println("θ_z: ", θ_z)
-
-    # # solar azimuth angle [deg]
-    # θ_a = atan2d(sind(H.value),
-    #              cosd(H.value) * sind(ϕ_local.value) - tand(β.value) * cosd(ϕ_local.value))
-    # return (
-    #     Quantity(θ_z, SymbolicDimensions, deg = 1),
-    #     Quantity(A, SymbolicDimensions, deg = 1))
+    HRA = 15us"deg/h" * (T_solar - 12us"h")
+    # return HRA < 0us"deg" ? HRA + 360us"deg" : mod(HRA, 360us"deg")
 end
 
 algorithm = BasicAlgorithm(Location(latitude = 0.0, longitude = 0.0))

src/Basic/Basic.jl

@@ -15,13 +15,13 @@ abstract type SolarPositionAlgorithm end
 function sunpos end
 
 components = (
-    mandatory = (
+    mandatory = (;
         sunpos_check = (
-        "interface implements the sunpos function" => a::Arguments -> sunpos(
-        a.algorithm, a.timestamp) isa Tuple{Quantity, Quantity}
+            "interface implements the sunpos function" => a::Arguments -> sunpos(
+            a.algorithm, a.timestamp) isa Tuple{Quantity, Quantity}
+        ),
     ),
-    ),
-    optional = ()
+    optional = (;)
 )
 
 description = """