diff --git a/src/CelestialBody.cs b/src/CelestialBody.cs
index b5d584b..ccc6b3b 100644
--- a/src/CelestialBody.cs
+++ b/src/CelestialBody.cs
@@ -110,6 +110,16 @@ public class CelestialBody /*: MonoBehaviour, ITargetable, IDiscoverable*/
     public double rotationPeriod;
     public CelestialBodyScienceParams scienceValues;
     /// <summary>
+    /// Average duration in seconds between two successive "local apparent noons" (= time at which the sun is straight
+    /// overhead a geostationary observer). For Kerbin, this value is lightly greater than "rotationPeriod". Used to
+    /// perform correct Kerbin calendar calculations where the sun raises always at the same "time".
+    /// </summary>
+    public double solarDayLength;
+    /// <summary>
+    /// Wheter this celestial body has a valid solar day.
+    /// </summary>
+    public bool solarRotationPeriod;
+    /// <summary>
     /// The radius of this body's sphere of influence (measured from the center of the body), in meters.
     /// </summary>
     public double sphereOfInfluence;
diff --git a/src/UTClock.cs b/src/UTClock.cs
new file mode 100644
index 0000000..929d10e
--- /dev/null
+++ b/src/UTClock.cs
@@ -0,0 +1,33 @@
+using System;
+using UnityEngine;
+
+/// <summary>
+/// Controls the date/time display at the bottom center of the space center.
+/// Can be retrieved with <code>UTClock utClock = GameObject.FindObjectOfType<UTClock>();</code>.
+///
+/// The actual text field containting the text is a private member of this behavior but
+/// can be retrieved with <code>ScreenSafeTextField textField =
+/// utClock.gameObject.GetComponent<ScreenSafeTextField>();</code>.
+/// </summary>
+[RequireComponent(typeof(ScreenSafeTextField))]
+public class UTClock : MonoBehaviour
+{
+	/// <summary>
+	/// Whether to include seconds in the text field (false).
+	/// </summary>
+	public bool includeSeconds;
+	
+	/// <summary>
+	/// Whether to include hours and minutes in the text field (true).
+	/// </summary>
+	public bool includeTimeOfDay;
+	
+	public double Tdawn;
+
+	/// <summary>
+	/// The button 'Warp to next Morning' to the right of the text field.
+	/// </summary>
+	public ScreenSafeUIButton warpToDaylight;
+
+	public UTClock();
+}