Header.md

+This page describes the content of a CZML document. Please read [How to get started]() for an explanation of how a CZML document is put together.
+
+# HEADER
+
+The header is the first object of a CZML file, it describes for example what kind of time interval in global will be used to display, or even how time will be interpolated during the simulation.
+
+**Extends** : [CZMLPrimaryObject]()
+
+**Example** :
+
+;;;
+  {
+    "id":"document",
+    "version":"1.0",
+    "name":"org.orekit.propagation.numerical.NumericalPropagator@ed9d034",
+    "clock":{
+      "interval":"2022-01-17T12:00:00Z/2022-01-18T12:00:00Z",
+      "currentTime":"2022-01-17T12:00:00Z",
+      "multiplier":60,
+      "range":"LOOP_STOP",
+      "step":"SYSTEM_CLOCK_MULTIPLIER"
+    }
+;;;
+
+# Properties 
+
+**id** - String : Identification of the header
+
+**version** - String : Version of Cesium to use, *default* : "1.0"
+
+**name** - String : Name of the header, describes what have been used to build it
+
+**Clock** - [Clock]() : The clock object, describes when the study will be done.
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