What to expect
Huacas del Sol y de la Luna sounds like two equivalent stops. Do not plan on that assumption. Visitor information focuses on Huaca de la Luna and Museo Santiago Uceda Castillo. Start with the museum address and take its explanation into the monument.
How it fits into a journey
Make a focused outing from Trujillo to the Moche countryside. Put Chan Chan in another part of the day if you want to compare both.