In this study astronomical formulas that are necessary for the mechanical structure of a line focused horizontal receiver-solar thermal power plant are examined. The subjected Power Plant is designed with "Linear Fresnel Reflectors".The astronomic formulas are developed to focus the sunrays on a receiver continuously with the single axis orientation of multiple planar reflectors. Rotation axis of the planar reflectors are placed North / South direction. By means of this study it is possible to determine the exact position of the sunrays on the receiver that is reflected from the planar reflectors. Both conditions for the horizontal and inclined placement of the power plant are studied separately. Rotation angles are used by evaluating the formulas.Considering changing sun position, it is shown that changes in the rotation angle for all of the planar reflectors are equal for continuous focusing. By means of this once the system is adjusted it can be controlled with a single motor for entire year. With the help of the equations evaluated during the study a small model is projected. For scaling the model the parabola is chosen from the Fresnel design principle. Then the reflector amount, reflector widths and distance between their rotation axes have been determined. Finally the measurement of the model is redesigned to make it possible for the production. A method is advised for calculating the extraterrestrial solar radiation amount absorbed on the system. And this method is executed for the projected model.