ASTS	automatic solar tracking system
BSRN	Baseline Surface Radiation Network
CSP	concentrating solar power
DHI	diffuse horizontal irradiance
DNI	direct normal irradiance
DT	decision tree
GCR	ground coverage ratio
GHI	global horizontal irradiance
LSTM	long short-term memory
MAE	mean absolute error
MLP	multi-layer perceptron
MSE	mean squared error
ME	max error
NCU	network controller unit
NREL	National Renewable Energy Laboratory
RF	random forest
SPA	solar position algorithm
ST	solar tracker
TCU	tracker control unit
TMY	typical meteorological year