Added comet data to the end of the year and a credit.

app/src/main/java/com/google/android/stardroid/layers/CometsLayer.kt

@@ -134,6 +134,7 @@ class CometsLayer(private val model: AstronomerModel, resources: Resources) :
   }
 
   private fun initializeComets() {
+    // Data credit: InTheSky.org
     comets.add(
       Comet(
         R.string.comet_leonard,
@@ -241,6 +242,30 @@ class CometsLayer(private val model: AstronomerModel, resources: Resources) :
             decDegreesFromDMS(-34f, 13f, 17f),
             9.71f
           ),
+          TimeEntry(
+            LocalDate.of(2021, 12, 28),
+            raDegreesFromHMS(21f, 22f, 31f),
+            decDegreesFromDMS(-34f, 20f, 38f),
+            9.71f
+          ),
+          TimeEntry(
+            LocalDate.of(2021, 12, 29),
+            raDegreesFromHMS(21f, 26f, 22f),
+            decDegreesFromDMS(-34f, 37f, 11f),
+            9.71f
+          ),
+          TimeEntry(
+            LocalDate.of(2021, 12, 30),
+            raDegreesFromHMS(21f, 29f, 39f),
+            decDegreesFromDMS(-34f, 51f, 29f),
+            9.71f
+          ),
+          TimeEntry(
+            LocalDate.of(2021, 12, 31),
+            raDegreesFromHMS(21f, 32f, 27f),
+            decDegreesFromDMS(-35f, 03f, 55f),
+            9.71f
+          ),
         )
       )
     )

app/src/main/res/values/help.xml

@@ -146,6 +146,7 @@ Hubble Images provided by NASA\'s Space Telescope Science Institute
 Meteor shower data from the International Meteor Organization
 (http://www.imo.net/data)<br/>
 M31 image by Peter Kennett (https://commons.wikimedia.org/wiki/File:M31(Kennett).jpg)<br/>
+Comet Leonard data: In-The-Sky.org<br/>
 </string>
 </resources>