Fixed temperature units to delta Celsius degrees

2 files changed, 5 insertions, 5 deletions

diff --git a/szilagyi/__init__.py b/szilagyi/__init__.py
index 67da4a8..bfde154 100644
--- a/szilagyi/__init__.py
+++ b/szilagyi/__init__.py
@@ -7,9 +7,9 @@ There is only one function provided, so the use should be straight-forward. For
 	>>> import pint
 	>>> import szilagyi
 	>>> u = pint.UnitRegistry()
-	>>> round(szilagyi.calculate_swi(10.5 * u.C, 24100 * u.ft), 3)
+	>>> round(szilagyi.calculate_swi(10.5 * u.delta_degC, 24100 * u.ft), 3)
 	0.811
-	>>> round(szilagyi.calculate_swi(7 * u.C, 12500 * u.ft), 3)
+	>>> round(szilagyi.calculate_swi(7 * u.delta_degC, 12500 * u.ft), 3)
 	-4.88
 """
 
@@ -27,11 +27,11 @@ def calculate_swi(temperature_difference: Quantity, convective_cloud_depth: Quan
 	of the original nomogram. The maximum values are available as MAX_TEMPERATURE_DIFFERENCE and MAX_CONVECTIVE_CLOUD_DEPTH
 	constants.
 	"""
-	if not temperature_difference.is_compatible_with("C"):
+	if not temperature_difference.is_compatible_with("delta_degC"):
 		raise ValueError("temperature_difference must be convertible to Celsius degrees")
 	if not convective_cloud_depth.is_compatible_with("ft"):
 		raise ValueError("convective_cloud_depth must be convertible to Feet")
-	temperature_difference = temperature_difference.m_as("C")
+	temperature_difference = temperature_difference.m_as("delta_degC")
 	convective_cloud_depth = convective_cloud_depth.m_as("ft")
 	if temperature_difference < 0 or temperature_difference > MAX_TEMPERATURE_DIFFERENCE:
 		raise ValueError(f"temperature_difference must be within <0, {MAX_TEMPERATURE_DIFFERENCE}> range")
diff --git a/szilagyi/tests.py b/szilagyi/tests.py
index 40d82f7..f0d0176 100644
--- a/szilagyi/tests.py
+++ b/szilagyi/tests.py
@@ -7,7 +7,7 @@ from . import calculate_swi
 class CalculateSwi(unittest.TestCase):
 	def setUp(self):
 		ureg = pint.UnitRegistry()
-		self.C = ureg.C
+		self.C = ureg.delta_degC
 		self.ft = ureg.ft
 
 	def test_out_of_range(self):