diff --git a/docker/Dockerfile b/docker/Dockerfile
index 6baec36b..85874c0a 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -27,6 +27,8 @@ COPY . /tuv-x/
 RUN mkdir /build \
       && cd /build \
       && cmake -D CMAKE_BUILD_TYPE=release \
+               -D TUVX_INSTALL_INCLUDE_DIR=/usr/local/include \
+               -D TUVX_INSTALL_MOD_DIR=/usr/local/include \
                /tuv-x \
       && make install -j 8
 
diff --git a/test/regression/CMakeLists.txt b/test/regression/CMakeLists.txt
index 947aed05..bc3bc78c 100644
--- a/test/regression/CMakeLists.txt
+++ b/test/regression/CMakeLists.txt
@@ -4,5 +4,6 @@
 add_subdirectory(photolysis_rates)
 add_subdirectory(dose_rates)
 add_subdirectory(radiators)
+add_subdirectory(solvers)
 
 ################################################################################
diff --git a/test/regression/solvers/CMakeLists.txt b/test/regression/solvers/CMakeLists.txt
new file mode 100644
index 00000000..9a23ea25
--- /dev/null
+++ b/test/regression/solvers/CMakeLists.txt
@@ -0,0 +1,11 @@
+################################################################################
+# Test utilities
+
+include(test_util)
+
+################################################################################
+# Phototolysis rate regression tests
+
+create_standard_test(NAME cpp_delta_eddington SOURCES delta_eddington.F90)
+
+################################################################################
\ No newline at end of file
diff --git a/test/regression/solvers/delta_eddington.F90 b/test/regression/solvers/delta_eddington.F90
new file mode 100644
index 00000000..20128eb7
--- /dev/null
+++ b/test/regression/solvers/delta_eddington.F90
@@ -0,0 +1,109 @@
+! Copyright (C) 2023-2024 National Center for Atmospheric Research
+! SPDX-License-Identifier: Apache-2.0
+program test_cpp_delta_eddington_solver
+
+  use musica_constants,                only: dk => musica_dk
+  use musica_string,                   only: string_t
+
+  implicit none
+
+  type(string_t) :: config_file_path
+
+  ! Run the TUV 5.4 test
+  config_file_path = 'examples/tuv_5_4.json'
+  call test_cpp_delta_eddington_solver_t(config_file_path)
+
+  ! Run the TS1/TSMLT test
+  config_file_path = 'examples/ts1_tsmlt.json'
+  call test_cpp_delta_eddington_solver_t(config_file_path)
+
+contains
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+  ! Runs the Fortran-based Delta-Eddington solver under prescribed conditions
+  ! and then runs the C++-based Delta-Eddington solver under the same
+  ! conditions, comparing the results.
+  subroutine test_cpp_delta_eddington_solver_t(config_file_path)
+
+    use tuvx_core,                     only: core_t
+    use tuvx_grid,                     only: grid_t
+    use tuvx_profile,                  only: profile_t
+    use tuvx_solver,                   only: radiation_field_t
+    use musica_string,                 only: string_t
+
+    type(string_t), intent(in) :: config_file_path
+
+    type(core_t),     pointer :: core
+    class(grid_t),    pointer :: time
+    class(profile_t), pointer :: solar_zenith_angle ! [degrees]
+    class(profile_t), pointer :: earth_sun_distance ! [AU]
+    type(radiation_field_t), allocatable :: f90_radiation_fields(:),          &
+                                            cpp_radiation_fields(:)
+    integer :: i_time
+
+    core => core_t(config_file_path)
+    time => core%get_grid( "time", "hours" )
+    solar_zenith_angle => core%get_profile( "solar zenith angle", "degrees" )
+    earth_sun_distance => core%get_profile( "Earth-Sun distance", "AU" )
+
+    ! Run the solver for each set of conditions
+    allocate( f90_radiation_fields( time%ncells_ ) )
+    do i_time = 1, time%ncells_
+      call core%run( solar_zenith_angle%edge_val_( i_time ),                  &
+                     earth_sun_distance%edge_val_( i_time ) )
+
+      f90_radiation_fields( i_time ) = core%get_radiation_field( )
+    end do
+    cpp_radiation_fields =                                                    &
+        calculate_cpp_radiation_fields( core,                                 &
+                                        solar_zenith_angle%edge_val_,         &
+                                        earth_sun_distance%edge_val_ )
+    call compare_radiation_fields( f90_radiation_fields, cpp_radiation_fields )
+
+    ! Clean up
+    deallocate( earth_sun_distance )
+    deallocate( solar_zenith_angle )
+    deallocate( time )
+    deallocate( core )
+    
+  end subroutine test_cpp_delta_eddington_solver_t
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+  ! Calculates the radiation field using the C++ Delta-Eddington solver
+  function calculate_cpp_radiation_fields( tuvx_core, solar_zenith_angle,      &
+      earth_sun_distance) result( radiation_fields )
+
+    use tuvx_core,                     only: core_t
+    use tuvx_profile,                  only: profile_t
+    use tuvx_solver,                   only: radiation_field_t
+
+    type(core_t),     intent(in) :: tuvx_core
+    real(dk),         intent(in) :: solar_zenith_angle(:)
+    real(dk),         intent(in) :: earth_sun_distance(:)
+    type(radiation_field_t), allocatable :: radiation_fields(:)
+
+    ! run the C++ Delta-Eddington solver
+    allocate( radiation_fields( size( solar_zenith_angle ) ) )
+
+  end function calculate_cpp_radiation_fields
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+  ! Compares the radiation fields calculated by the Fortran and C++ solvers
+  subroutine compare_radiation_fields( f90_radiation_fields, cpp_radiation_fields )
+
+    use tuvx_solver, only: radiation_field_t
+
+    type(radiation_field_t), intent(in) :: f90_radiation_fields(:)
+    type(radiation_field_t), intent(in) :: cpp_radiation_fields(:)
+
+    ! Compare the radiation fields
+    ! ...
+
+  end subroutine compare_radiation_fields
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+end program test_cpp_delta_eddington_solver
\ No newline at end of file