Abstract: A solar energy collection system including a number of parabolic section reflectors mounted for rotation about their lines of focii. A drive system continuously rotates the reflectors at a one cycle per day rate in one form. Positioned at the line of focus of each reflector is a receiver tube carrying a heat exchange medium. The receiver tube is fixed and non-moving and is surrounded by a fixed transparent tube shielding the receiver tube from air currents. The transparent tube is sealed except for a leakage path through a desiccant containing chamber which is in thermal transfer relationship with the receiver tube and communicating with the ambient atmosphere. Means for cleaning the reflectors when in the inverted position is provided. Another embodiment provides for sun tracking and automatic night storage and cleaning. Novel mirror receiver tube and desiccant assembly features are disclosed.