I Need Help Building A Rocket/Missile That Hits A Target on The Other Side of a Planet

Greetings Everyone,

I need help building a missile or rocket that has the potential of hitting a t\arget anywhere on a planet, but the part where hitting the target on the other side of the planet is very difficult

(I have 2 months of coding exp. with c# not much with javascript) This is what i used, but i can't get the missile to hit the target on the other side without it leaving completely out of view and coming back a lot later

 #pragma strict
 var missileVelocity : float = 300;
 var turn : float = 20;
 var homingMissile : Rigidbody;
 var fuseDelay : float;
 var missileMod : GameObject;
 var smokePrefab : ParticleSystem;
 var missileClip : AudioClip;
 
 var force : Vector3;       //variable for "lift" of the rocket
 
 var relativeTorque : Vector3; //variable for torque (spin) of rocket
 
 var liftSpeed : float;    //determines how much force will be applied
 
 var turnSpeed : float;    //determines how much torque will be appled
 
 private var target : Transform;
 function Start()
 {
 homingMissile = transform.rigidbody;
 Fire();
 }
  
 function Fire()
 {
 yield WaitForSeconds(fuseDelay);
 AudioSource.PlayClipAtPoint(missileClip, transform.position);
 var distance = Mathf.Infinity;
 for (var go : GameObject in GameObject.FindGameObjectsWithTag("target"))
  {
      var diff = (go.transform.position - transform.position).sqrMagnitude;
      if(diff < distance)
 {
 distance = diff;
 target = go.transform;
 
         constantForce.force = Vector3.up * liftSpeed;    //determines the "lift"
         
         constantForce.relativeTorque= Vector3(0,turnSpeed,0);
         
 
 }
 }
 }
 function FixedUpdate()
 {
 if(target == null || homingMissile == null)
 return;
 homingMissile.velocity = transform.forward * missileVelocity;
 var targetRotation = Quaternion.LookRotation(target.position - transform.position);
 homingMissile.MoveRotation(Quaternion.RotateTowards(transform.rotation, targetRotation, turn));
 }
 function OnCollisionEnter(theCollision : Collision)
 {
 if(theCollision.gameObject.name == "Cube")
 {
 smokePrefab.emissionRate = 0.0f;
 Destroy(missileMod.gameObject);
  yield WaitForSeconds(5);
  Destroy(gameObject);
 }
 }

Please can anyone help me with a solution, Thank you.

Notes: now i tried every way possible with the code i have, but i can't achieve it. (some Ideas) I also tried adding gravity to the planet but it messes the targeting of the rocket, I thought about using a straight plane and adding a shader to curve it into a planet, but I don't know how. I have used way points but it doesn't look right, the rocket points else where.