Minecraft wiki entry for History, associated text: Entity data
 id: Entity Type ID. Known values are 13 for Sheep, 32 for Zombie, and 64 for item drops.
 Pos: 3 TAG_Floats describing the current X,Y,Z position of the entity.
 Motion: 3 TAG_Floats describing the current dX,dY,dZ velocity of the entity. (Note: 0,0,0 is no motion.)
 Rotation: Two TAG_Floats representing rotation in degrees.
: The entity's rotation clockwise around the Y axis (called yaw). Due west is 0. Can have large values because it accumulates all of the entity's lateral rotation throughout the game.
: The entity's declination from the horizon (called pitch). Horizontal is 0. Positive values look downward. Does not exceed positive or negative 90 degrees.
 FallDistance: Distance the entity has fallen. Larger values cause more damage when the entity lands.
 Fire: Number of ticks until the fire is put out. Negative values reflect how long the entity can stand in fire before burning.
 Air: How much air the entity has, in ticks. Fills to a maximum of 300 in air. Decreases while underwater.
 OnGround: 1 if the entity is touching the ground.