[Refactor] Move Răhukăla calculations to a separate function

seasonal_clock/times.py

@@ -92,31 +92,49 @@ def collect_day_parts(
     return day_parts
 
 
+def get_rahukaalam_times(
+        observer: LocationInfo,
+        date: datetime,
+        surrounding_days: bool = False
+) -> List[Tuple[datetime, datetime]]:
+    """Get today’s Răhukăla times"""
+
+    if surrounding_days:
+        yesterday = date - timedelta(days=1)
+        tomorrow = date + timedelta(days=1)
+        dates = [yesterday, date, tomorrow]
+    else:
+        dates = [date]
+
+    times: List[Tuple[datetime, datetime]] = []
+
+    for day in dates:
+        try:
+            daytime_rahukaala = sun.rahukaalam(observer, date=day, daytime=True)
+        except ValueError:
+            pass
+        else:
+            times.append(daytime_rahukaala)
+
+        try:
+            night_rahukaala = sun.rahukaalam(observer, date=day, daytime=False)
+        except ValueError:
+            pass
+        else:
+            times.append(night_rahukaala)
+
+    times.sort(key=lambda items: items[0])
+
+    return times
+
+
 def get_rahukaalam(
     observer: LocationInfo, date: datetime
 ) -> Tuple[Optional[bool], datetime]:
     """Get the time of the next Rāhukāla or, if we are in the middle of one, the time of its end"""
 
-    yesterday = date - timedelta(days=1)
+    times = get_rahukaalam_times(observer, date, surrounding_days=True)
-    tomorrow = date + timedelta(days=1)
-    times: List[Tuple[datetime, datetime]] = []
 
-    for day in (yesterday, date, tomorrow):
-        try:
-            daytime_rahukaalam = sun.rahukaalam(observer, date=day, daytime=False)
-        except ValueError:
-            pass
-        else:
-            times.append(daytime_rahukaalam)
-
-        try:
-            night_rahukaalam = sun.rahukaalam(observer, date=day, daytime=True)
-        except ValueError:
-            pass
-        else:
-            times.append(night_rahukaalam)
-
-    times.sort(key=lambda items: items[0])
     active: bool = False
     next_time: Optional[datetime] = None