[Physics2D] Rigidbody.Velocity and Alignement of Sprite Rotation

I am using a Physics2D, RigidBody2D.
I am applying an orbiting, gravity like force, so the player can rotate around planets, or is affected by their pull.

My issue is rotating either the rigdbody itself or a child'd sprite.transform, to point (rotate) in the direction of movement.


How can I best achieve this?

 

Code (CSharp):

1. float heading = Mathf.Atan2(rigidbody.velocity.x, rigidbody.velocity.z);
2. Quaternion rotation = Quaternion.Euler(0, heading, 0);

https://forum.unity.com/threads/scr...rds-velocity-direction-only-in-y-axis.296952/