A stellar atmospheric refraction measurement correction method based on collinearity of refraction surfaces, comprising: performing star identification on the basis of observed star vectors in a star sensor and the reference star catalog, to obtain matching relationships between observed stars and reference stars; converting reference star vectors corresponding to the observed stars to a geographic coordinate system before entering the atmosphere to obtain zenith distances and azimuth angles of incident stellar; on the basis of a principle of collinearity of refraction surfaces, performing optimal solving according to imaging coordinates of observation stars, to obtain the optimal position coordinates of the zenith direction on an imaging surface of the star sensor; according to the optimal zenith direction, performing atmospheric refraction correction on all the recognized observed stars by means of the trigonometric cosine formula to obtain corrected star coordinates; and performing optimal solving to obtain the attitude of the star sensor in the geographic coordinate system.

A LED Light device for house or stores or business application having built-in camera unit is powered by AC or-and DC power source for a lamp-holder, LED bulb, security light, flashlight, car torch light, garden, entrance door light or other indoor or outdoor LED light device connected to power source by (1) prongs or (2) male-base has conductive piece can be inserted into a female receiving-piece which connect with power source or (3) wired or AC-plug wires. The device has built-in camera-system has plurality functions to make different products and functions. The LED light device has at least one of (a) camera or DV (digital video) to take minimum MP4 or 4K image or photos, (b) digital data memory kits or cloud storage station, (c) wireless connection kits, Bluetooth or USB set for download function, (d) MCU or CPU or IC with circuit with desired motion sensor/moving detector(s)/other sensor, (e) camera-assembly for connecting Wi-Fi, Wi-Fi extend, or-and 3G/4G/5G network or even settle-lite channel, (f) system to transmit or-and receiving wireless signal, (g) APP or other platform incorporated with pre-programed or even AI (artificial intelligence) software has optional area-selections function to make screen-comparison or image comparison to operation pre-program or related device including but not limited to detect moving object(s), face recognition or personal identification or-and habit or-and crime comparison, purchase, (h) LED light source to offer sufficient brightness under dark environment for camera-assembly take color data, (i) other electric or mechanical parts & accessories, (j) has moving detector and software built-in to make comparison to judge the movement object of the preferred screen selected-areas; to get desired function(s) for the said LED light device. The said motion sensor/moving detector or other sensor unit has desired camera and Wi-Fi system and part or all of digital data related module or circuit(s) or backup power, and (k) camera-assembly may in separated housing incorporated with all kind of existing light source so people can upgrade the non-camera device to has built-in camera and digital device for their old non-camera security light.

A technique for polar aligning the mount of a telescope or other astronomical instrument includes acquiring star images from an electronic polar scope and determining a location of a celestial pole relative to the star images based on computerized matching of the star images to information in a database. The mount has a right-ascension (RA) axis, and the technique directs an adjustment to the mount so as to align a location of the RA axis with the determined location of the celestial pole.

A heliostat calibration system having a system controller, and a heliostat having a heliostat controller, wherein: the system controller is configured to receive a calibration data point and initial calibration offset angle guess, calculate a tracking error, identify a calibration offset angle, and the heliostat controller configured to transmit a calibration data point, receive adjustment instructions, and execute the adjustment instructions.

Solar trackers that may be advantageously employed on sloped and/or variable terrain to rotate solar panels to track motion of the sun across the sky include bearing assemblies and other mechanical features configured to address mechanical challenges posed by the sloped and/or variable terrain that might otherwise prevent or complicate use of solar trackers on such terrain.

A solar tracker system is a system and method to integrate the solar cells to a greenhouse. The solar tracker system comprises solar tracker modules that include solar cells, racks, gears, pinons, motors, and mounting brackets to efficiently and conveniently be installed to the roofs and walls of a new greenhouse and/or an existing greenhouse for retrofit application. Additionally, the solar tracker system uses various sensors to provide real-time conditions to the greenhouse. The method uses actual or system default values to adjust the angle and position of solar cells according to various environmental factors, such as DLI, weather, date, time, direction of sunlight, or type of plant.

A system is provided. The system includes a tracker configured to collect solar irradiance and attached to a rotational mechanism for changing a plane of the tracker and a controller in communication with the rotational mechanism. The controller is programmed to store a plurality of positional information and a shadow model for determining placement of shadows based on positions of objects relative to the sun, determine a position of the sun at a first specific point in time, retrieve height information for the tracker and at least one adjacent tracker, execute the shadow model based on the retrieved height information and the position of the sun, determine a first angle for the tracker based on the executed shadow model, and transmit instructions to the rotational mechanism to change the plane of the tracker to the first angle.

An aerial system, including a processing system, an optical system, an actuation system and a lift mechanism, includes an autonomous photography and/or videography system 70, implemented, at least in part, by the processing system 22, the optical system 26, the actuation system 28 and the lift mechanism 32. The autonomous photograph and/or videography system performs the steps of establishing a desired flight trajectory, detecting a target, controlling the flight of the aerial system as a function of the desired flight trajectory relative to the target using the lift mechanism and controlling the camera to capture pictures and/or video.

A power generation structure bearing assembly including a housing adapted to support a rail, where the housing includes a first housing member operatively attached to a support beam having a central axis, and an second housing member operatively attached to the rail, where the housing allows for movement of the rail in three degrees of freedom relative to the central axis with a mechanical stop on movement in at least one degree of freedom.

Embodiments of the present invention may utilize one or more techniques, alone or in combination, to maximize a surface area of a receiver that is configured to convert light into another form of energy. One technique enhances collection efficiency by controlling a size, shape, and/or position of a cell relative to an expected illumination profile under various conditions. Another technique positions non-active elements (such as electrical contacts and/or interconnects) on surfaces likely to be shaded from incident light by other elements of the receiver. Another technique utilizes embodiments of interconnect structures occupying a small footprint. According to certain embodiments, the receiver may be cooled by exposure to a fluid such as water or air.