normalization of methods

lib/cycles/solar/Solar.Tests.cs

@@ -160,7 +160,7 @@ public class SolarTests
             series.Add(new TValue(startDate.AddDays(i), 100.0 + i));
         }
 
-        var result = Solar.Calculate(series);
+        var result = Solar.Batch(series);
 
         Assert.Equal(30, result.Count);
 

lib/cycles/solar/Solar.cs

@@ -91,7 +91,7 @@ public sealed class Solar : AbstractBase
     /// <summary>
     /// Creates a new Solar indicator and calculates cycles for the source series.
     /// </summary>
-    public static TSeries Calculate(TSeries source)
+    public static TSeries Batch(TSeries source)
     {
         var solar = new Solar();
         return solar.Update(source);
@@ -114,6 +114,13 @@ public sealed class Solar : AbstractBase
         }
     }
 
+    public static (TSeries Results, Solar Indicator) Calculate(TSeries source)
+    {
+        var indicator = new Solar();
+        TSeries results = indicator.Update(source);
+        return (results, indicator);
+    }
+
     /// <summary>
     /// Calculates solar cycle for a specific DateTime.
     /// </summary>