diff --git a/Common/src/main/java/at/petrak/hexcasting/common/lib/hex/HexActions.java b/Common/src/main/java/at/petrak/hexcasting/common/lib/hex/HexActions.java
index c18a7ce1..977c3bc8 100644
--- a/Common/src/main/java/at/petrak/hexcasting/common/lib/hex/HexActions.java
+++ b/Common/src/main/java/at/petrak/hexcasting/common/lib/hex/HexActions.java
@@ -211,6 +211,8 @@ public class HexActions {
         new ActionRegistryEntry(HexPattern.fromAngles("adeeeee", HexDir.NORTH_EAST), OpArcCos.INSTANCE));
     public static final ActionRegistryEntry ARCTAN = make("arctan",
         new ActionRegistryEntry(HexPattern.fromAngles("eadeeeeew", HexDir.NORTH_EAST), OpArcTan.INSTANCE));
+    public static final ActionRegistryEntry ARCTAN2 = make("arctan2",
+        new ActionRegistryEntry(HexPattern.fromAngles("deadeeeeewd", HexDir.WEST), OpArcTan2.INSTANCE));
     public static final ActionRegistryEntry LOGARITHM = make("logarithm",
         new ActionRegistryEntry(HexPattern.fromAngles("eqaqe", HexDir.NORTH_WEST), OpLog.INSTANCE));
     public static final ActionRegistryEntry MODULO = make("modulo",
diff --git a/Common/src/main/resources/assets/hexcasting/lang/en_us.json b/Common/src/main/resources/assets/hexcasting/lang/en_us.json
index 60daa2f3..3eca1657 100644
--- a/Common/src/main/resources/assets/hexcasting/lang/en_us.json
+++ b/Common/src/main/resources/assets/hexcasting/lang/en_us.json
@@ -327,6 +327,7 @@
   "hexcasting.action.book.hexcasting:arcsin": "Inverse Sine Prfn.",
   "hexcasting.action.book.hexcasting:arccos": "Inverse Cosine Prfn.",
   "hexcasting.action.book.hexcasting:arctan": "Inverse Tangent Prfn.",
+  "hexcasting.action.book.hexcasting:arctan2": "Inverse Tan. Prfn. II",
   "hexcasting.action.book.hexcasting:const/vec/x": "Vector Rfln. +X/-X",
   "hexcasting.action.book.hexcasting:const/vec/y": "Vector Rfln. +Y/-Y",
   "hexcasting.action.book.hexcasting:const/vec/z": "Vector Rfln. +Z/-Z",
@@ -445,6 +446,7 @@
   "hexcasting.action.hexcasting:arcsin": "Inverse Sine Purification",
   "hexcasting.action.hexcasting:arccos": "Inverse Cosine Purification",
   "hexcasting.action.hexcasting:arctan": "Inverse Tangent Purification",
+  "hexcasting.action.hexcasting:arctan2": "Inverse Tangent Purification II",
   "hexcasting.action.hexcasting:random": "Entropy Reflection",
   "hexcasting.action.hexcasting:logarithm": "Logarithmic Distillation",
   "hexcasting.action.hexcasting:coerce_axial": "Axial Purification",
@@ -952,6 +954,7 @@
   "hexcasting.page.advanced_math.arcsin": "Takes the inverse sine of a value with absolute value 1 or less, yielding the angle whose sine is that value. Related to the values of $(l:patterns/consts#hexcasting:const/double/pi)$(thing)π/$ and $(l:patterns/consts#hexcasting:const/double/tau)$(thing)τ/$.",
   "hexcasting.page.advanced_math.arccos": "Takes the inverse cosine of a value with absolute value 1 or less, yielding the angle whose cosine is that value. Related to the values of $(l:patterns/consts#hexcasting:const/double/pi)$(thing)π/$ and $(l:patterns/consts#hexcasting:const/double/tau)$(thing)τ/$.",
   "hexcasting.page.advanced_math.arctan": "Takes the inverse tangent of a value, yielding the angle whose tangent is that value. Related to the values of $(l:patterns/consts#hexcasting:const/double/pi)$(thing)π/$ and $(l:patterns/consts#hexcasting:const/double/tau)$(thing)τ/$.",
+  "hexcasting.page.advanced_math.arctan2": "Takes the inverse tangent of a Y and X value, yielding the angle between the X-axis and a line from the origin to that point.",
   "hexcasting.page.advanced_math.logarithm": "Removes the number at the top of the stack, then takes the logarithm of the number at the top using the other number as its base. Related to the value of $(l:patterns/consts#hexcasting:const/double/e)$(thing)$(italic)e/$.",
   
   "hexcasting.entry.sets": "Sets",
diff --git a/Common/src/main/resources/data/hexcasting/patchouli_books/thehexbook/en_us/entries/patterns/advanced_math.json b/Common/src/main/resources/data/hexcasting/patchouli_books/thehexbook/en_us/entries/patterns/advanced_math.json
index 1e846266..0a2aa609 100644
--- a/Common/src/main/resources/data/hexcasting/patchouli_books/thehexbook/en_us/entries/patterns/advanced_math.json
+++ b/Common/src/main/resources/data/hexcasting/patchouli_books/thehexbook/en_us/entries/patterns/advanced_math.json
@@ -54,6 +54,14 @@
       "output": "num",
       "text": "hexcasting.page.advanced_math.arctan"
     },
+    {
+      "type": "hexcasting:pattern",
+      "op_id": "hexcasting:arctan2",
+      "anchor": "hexcasting:arctan2",
+      "input": "num, num",
+      "output": "num",
+      "text": "hexcasting.page.advanced_math.arctan2"
+    },
     {
       "type": "hexcasting:pattern",
       "op_id": "hexcasting:logarithm",