diff --git a/day_integration_test.yaml b/day_integration_test.yaml
index f7a6257..fbb3e16 100644
--- a/day_integration_test.yaml
+++ b/day_integration_test.yaml
@@ -39,7 +39,7 @@ modules:
             c_y: 5.11194838e+02
 
           mask_filepath: "data/mask.npy"
-
+          sun_apparent_size: 0.54
           cloud_map:
             threshold: 3.5
 
diff --git a/example.yaml b/example.yaml
index c263da0..a70f474 100644
--- a/example.yaml
+++ b/example.yaml
@@ -50,6 +50,9 @@ pipelines:
         # Under which color ratio a pixel is considered cloudy (blue/red + blue/green)
         threshold: 3.5
 
+      # Apparent size of the sun in the allsky image in degree
+      sun_apparent_size: 0.54
+
       coverage_info:
         # Altitude which is considered to be the lower boundary of the zenith to average for the zenith cloud fraction measurement (in degree)
         zenith_altitude: 80
diff --git a/pyobs_cloudcover/pipeline/day/pipeline_factory.py b/pyobs_cloudcover/pipeline/day/pipeline_factory.py
index 4e5defb..a5e7a20 100644
--- a/pyobs_cloudcover/pipeline/day/pipeline_factory.py
+++ b/pyobs_cloudcover/pipeline/day/pipeline_factory.py
@@ -20,7 +20,7 @@ def __call__(self, options: DayPipelineOptions) -> DayPipeline:
         mask = np.load(options.mask_filepath)
         alt_az_generator = AltAzMapGenerator(model, 0)
         cloud_map_generator_factory = CloudMapGeneratorFactory(options.cloud_map)
-        sun_masker = SunMasker(self._observer)
+        sun_masker = SunMasker(options.sun_apparent_size, self._observer)
         coverage_info_calculator_factory = CloudInfoCalculatorFactory(options.coverage_info)
 
         return DayPipeline(mask, alt_az_generator, cloud_map_generator_factory(), sun_masker, coverage_info_calculator_factory())
diff --git a/pyobs_cloudcover/pipeline/day/pipeline_options.py b/pyobs_cloudcover/pipeline/day/pipeline_options.py
index dcc25f6..10333ff 100644
--- a/pyobs_cloudcover/pipeline/day/pipeline_options.py
+++ b/pyobs_cloudcover/pipeline/day/pipeline_options.py
@@ -7,17 +7,19 @@
 
 
 class DayPipelineOptions:
-    def __init__(self, model_options: Dict[str, Any], mask_filepath: str, cloud_map: CloudMapGeneratorOptions, coverage_info: CloudInfoCalculatorOptions) -> None:
+    def __init__(self, model_options: Dict[str, Any], mask_filepath: str, sun_apparent_size: float, cloud_map: CloudMapGeneratorOptions, coverage_info: CloudInfoCalculatorOptions) -> None:
         self.model_options = model_options
         self.coverage_info = coverage_info
         self.cloud_map = cloud_map
         self.mask_filepath = mask_filepath
+        self.sun_apparent_size = sun_apparent_size
 
     @classmethod
     def from_dict(cls, options: Dict[str, Dict[str, Any]]) -> DayPipelineOptions:
         model_options = options.get("world_model", {})
         mask_filepath = cast(str, options.get('mask_filepath'))
+        sun_apparent_size = float(cast(float, options.get('sun_apparent_size')))
         cloud_map = CloudMapGeneratorOptions.from_dict(cast(Dict[str, Any], options.get('cloud_map')))
         coverage_info = CloudInfoCalculatorOptions.from_dict(cast(Dict[str, Any], options.get('coverage_info')))
 
-        return DayPipelineOptions(model_options, mask_filepath, cloud_map, coverage_info)
+        return DayPipelineOptions(model_options, mask_filepath, sun_apparent_size, cloud_map, coverage_info)
diff --git a/pyobs_cloudcover/pipeline/day/sun_masker.py b/pyobs_cloudcover/pipeline/day/sun_masker.py
index 53b8938..f359498 100644
--- a/pyobs_cloudcover/pipeline/day/sun_masker.py
+++ b/pyobs_cloudcover/pipeline/day/sun_masker.py
@@ -7,13 +7,12 @@
 
 
 class SunMasker:
-    SUN_APPARENT_SIZE = np.deg2rad(0.54)
-
-    def __init__(self, observer: Observer):
+    def __init__(self, sun_apparent_size: float, observer: Observer):
+        self._sun_apparent_size = sun_apparent_size
         self._observer = observer
 
     def __call__(self, sky_query: SkyPixelQuery, obs_time: datetime.datetime) -> SkyPixelQuery:
         sun_alt_az = self._observer.sun_altaz(obs_time)
-        sky_query.mask_radius(AltAzCoord(sun_alt_az.alt.rad, sun_alt_az.az.rad), self.SUN_APPARENT_SIZE)
+        sky_query.mask_radius(AltAzCoord(sun_alt_az.alt.rad, sun_alt_az.az.rad), np.deg2rad(self._sun_apparent_size))
 
         return sky_query
diff --git a/tests/integration/test_day_pipeline.py b/tests/integration/test_day_pipeline.py
index 947c132..4920cd4 100644
--- a/tests/integration/test_day_pipeline.py
+++ b/tests/integration/test_day_pipeline.py
@@ -27,7 +27,7 @@ def test_day_pipeline() -> None:
 
     alt_az_generator = AltAzMapGenerator(model, 20)
     cloud_map_gen = CloudMapGenerator(3.0)
-    sun_masker = SunMasker(observer)
+    sun_masker = SunMasker(0.54, observer)
 
     coverage_change_calculator = CoverageChangeCalculator()
     zenith_masker = ZenithCloudCoverageCalculator(80)
diff --git a/tests/integration/test_day_pipeline_factory.py b/tests/integration/test_day_pipeline_factory.py
index f0f525e..78cd032 100644
--- a/tests/integration/test_day_pipeline_factory.py
+++ b/tests/integration/test_day_pipeline_factory.py
@@ -31,6 +31,7 @@ def test_day_pipeline() -> None:
             "c_y": 5.11194838e+01
         },
         "mask_filepath": "tests/integration/small_dummy_mask.npy",
+        "sun_apparent_size": 0.54,
         "cloud_map": {
             "threshold": 3.5
         },