diff --git a/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/calc/MoonCalc.java b/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/calc/MoonCalc.java
index b20a60148d51c..0cde817c1924c 100644
--- a/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/calc/MoonCalc.java
+++ b/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/calc/MoonCalc.java
@@ -121,7 +121,7 @@ private void setMoonPhase(Calendar calendar, Moon moon) {
         double julianDateEndOfDay = DateTimeUtils.endOfDayDateToJulianDate(calendar);
         double parentNewMoon = getPreviousPhase(calendar, julianDateEndOfDay, NEW_MOON);
         double age = Math.abs(parentNewMoon - julianDateEndOfDay);
-        phase.setAge((int) age);
+        phase.setAge(age);
 
         long parentNewMoonMillis = DateTimeUtils.toCalendar(parentNewMoon).getTimeInMillis();
         long ageRangeTimeMillis = phase.getNew().getTimeInMillis() - parentNewMoonMillis;
diff --git a/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/model/MoonPhase.java b/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/model/MoonPhase.java
index 435c77918498a..2787c5afe7c46 100644
--- a/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/model/MoonPhase.java
+++ b/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/model/MoonPhase.java
@@ -32,7 +32,7 @@ public class MoonPhase {
     private Calendar full;
     private Calendar thirdQuarter;
     private Calendar _new;
-    private int age;
+    private double age;
     private double illumination;
     private double agePercent;
     private double ageDegree;
@@ -105,7 +105,7 @@ public QuantityType<Time> getAge() {
     /**
      * Sets the age in days.
      */
-    public void setAge(int age) {
+    public void setAge(double age) {
         this.age = age;
     }