diff --git a/lib/src/sunnah_times.dart b/lib/src/sunnah_times.dart
index 08a29eb..d515fb4 100644
--- a/lib/src/sunnah_times.dart
+++ b/lib/src/sunnah_times.dart
@@ -3,6 +3,12 @@ import 'data/calendar_util.dart';
 import 'data/date_components.dart';
 
 class SunnahTimes {
+  /// The beginning of the first third of the period between Maghrib and Fajr
+  late DateTime _firstThirdOfTheNight;
+
+  /// The beginning of the first third of the period between Maghrib and Fajr
+  DateTime get firstThirdOfTheNight => _firstThirdOfTheNight;
+
   /// The midpoint between Maghrib and Fajr
   late DateTime _middleOfTheNight;
 
@@ -36,6 +42,9 @@ class SunnahTimes {
                 prayerTimes.maghrib.millisecondsSinceEpoch) ~/
             1000;
 
+    _firstThirdOfTheNight = CalendarUtil.roundedMinute(prayerTimes.maghrib.add(
+        Duration(seconds: (nightDurationInSeconds ~/ 3.0).toInt())));
+
     _middleOfTheNight = CalendarUtil.roundedMinute(prayerTimes.maghrib
         .add(Duration(seconds: nightDurationInSeconds ~/ 2.0)));