diff --git a/src/swiftest/swiftest_drift.f90 b/src/swiftest/swiftest_drift.f90
index 864c745ec..c67e03be5 100644
--- a/src/swiftest/swiftest_drift.f90
+++ b/src/swiftest/swiftest_drift.f90
@@ -583,15 +583,17 @@ end subroutine swiftest_drift_kepu_stumpff
    module subroutine swiftest_drift_cb_rotphase_update(self, param, dt)
       !! Author : Kaustub Anand
       !! subroutine to update the rotation phase of the central body
-      !! Units: Radians
+      !! Units: None
+      !!
       !! initial 0 is set at the x-axis 
+      !! phase is stored and calculated in a unitless manner, i.e., a phase of 0, 0.5, 1 = 0, pi, 2pi radians = 0, 180, 360 degrees
 
       ! Arguments
       class(swiftest_cb),           intent(inout) :: self   !! Swiftest central body data structure
       class(swiftest_parameters),   intent(in)    :: param  !! Current run configuration parameters 
       real(DP),                     intent(in)    :: dt     !! Stepsize
 
-      self%rotphase = MOD(self%rotphase + (.mag. self%rot(:)) * dt * param%TU2S, 2 * PI) ! radians
+      self%rotphase = MOD(self%rotphase + (.mag. self%rot(:)) * dt * param%TU2S, 2 * PI) / (2 * PI) ! phase angle calculated in radians and then scaled by 2pi to be unitless
 
    end subroutine swiftest_drift_cb_rotphase_update
 
diff --git a/src/swiftest/swiftest_sph.f90 b/src/swiftest/swiftest_sph.f90
index 4c7d6bd7c..3f6b7f40c 100644
--- a/src/swiftest/swiftest_sph.f90
+++ b/src/swiftest/swiftest_sph.f90
@@ -26,7 +26,7 @@ module subroutine swiftest_sph_g_acc_one(GMcb, r_0, phi_cb, rh, c_lm, g_sph, GMp
         ! Arguments
         real(DP), intent(in)        :: GMcb                        !! GMass of the central body
         real(DP), intent(in)        :: r_0                         !! radius of the central body
-        real(DP), intent(in)        :: phi_cb                      !! rotation phase of the central body
+        real(DP), intent(in)        :: phi_cb                      !! rotation phase of the central body (from 0 to 1)
         real(DP), intent(in), dimension(:)          :: rh          !! distance vector of body
         real(DP), intent(in), dimension(:, :, :)    :: c_lm        !! Spherical Harmonic coefficients
         real(DP), intent(out), dimension(NDIM)         :: g_sph    !! acceleration vector
@@ -47,6 +47,7 @@ module subroutine swiftest_sph_g_acc_one(GMcb, r_0, phi_cb, rh, c_lm, g_sph, GMp
         real(DP)     :: fac1, fac2, r_fac   !! calculation factors 
 
         g_sph(:) = 0.0_DP
+        phi_cb = phi_cb * 2 * PI ! scale the phase by 2pi radians
         theta = atan2(sqrt(rh(1)**2 + rh(2)**2), rh(3))
         phi = atan2(rh(2), rh(1)) 
         phi_bar = MOD(phi - phi_cb, 2 * PI) ! represents the phase difference between the central body's and the particle's phase