  The kinematics of the Solar zenith passage on the Earth was shown as a simple
harmonic motion. This analytical model used the uniform circular motion to
describe the Earth's rotation relative to its axis and relative to the Sun,
also this model considered the sunlight beams parallel and constant the
obliquity of the ecliptic. We made a contrast between some data taken from of
the software Stellarium 0.12.1 and the model, we obtained an uncertainty
$\Delta t=1d$; this result allow to project the model as an astronomical
context conducive to develop the kinematics of simple harmonic motion.
