$\mathit{a}$	solar collector width
$\mathit{b}$	solar collector height
${\mathit{d}}_{\mathit{j}}$	Julian day
$\mathit{i}$	index assigned to each solar tracker
$\mathit{j}$	secondary index assigned to each solar tracker ($\mathit{i}\ne \mathit{j})$
$\mathit{N}$	number of solar trackers in the installation
$\overrightarrow{\mathit{i}},\overrightarrow{\mathit{j}},\overrightarrow{\mathit{k}}$	unit vectors associated to a local Cartesian system
$\overrightarrow{\mathit{s}}$	solar vector
${\mathit{s}}_{\mathit{x}}, {\mathit{s}}_{\mathit{y}}, {\mathit{s}}_{\mathit{z}}$	components of solar vector
$\overrightarrow{\mathit{n}}$	unit vector perpendicular to the collector surface that indicates the direction towardsthe tracker is oriented
$\overrightarrow{\mathit{u}}$	unit horizontal vector included in the collector plane
$\overrightarrow{\mathit{v}}$	unit vector included in the collector plane and perpendicular to $\overrightarrow{\mathit{u}}$
$\mathit{t}$	specific solar hour
$\mathit{x}, \mathit{y}, \mathit{z}$	Cartesian coordinates of the base of each solar tracker
$\mathit{x} \left. [\mathit{i}\right], \mathit{y}\left. [\mathit{i}\right], \mathit{z}\left. [\mathit{i}\right]$	arrays containing information about coordinates of each solar tracker
Greek Letters
$\alpha$	elevation angle of the collector
$\gamma$	azimuth angle of the collector rotation axis
$\phi$	latitude
$\Omega$	Earth’s rotation speed
$\delta$	solar declination
$\theta$	angle of incidence of sunbeams on the inclined plane
$\Gamma$	auxiliary angular magnitude dependent on the Julian day