FIELD: aviation.
SUBSTANCE: onshore facilities observation from spacecraft (SC) moving on circular orbit refers to the field of remote monitoring of natural and anthropogenic processes. The method of onshore facilities observation from SC moving on circular orbit includes determining the current orbital parameters, shooting of objects from the spacecraft in moments taken after a given time interval, and determining the rate of objects state change from the images obtained. In addition, the spacecraft's orbit is additionally corrected, changing its height in the selected range to a value at which for each object under study the arguments of the 
, 
latitude orbit subsolar point at the timepoints of start and end of the object required observation interval are respectively determined by the relations 
, where B is the latitude of the object, hS is the required minimum height of the Sun above the object when it is observed, ι> 0 is the inclination of the orbit, - β the angle between the direction to the Sun and the plane of the orbit, for each object under study, starting from the moment of equality of the Sun height over the object to the value of hS as it increases, the object is shot at the moments taken in a given interval of time chosen from the condition of determining the change in the state of the object according to the resulting images. After that, the object is shot at intervals, counted from the moment of the previous shooting of the object, starting with the time chosen from the condition of determining the change in the state of the object according to the images to be obtained, and ending with the current time, which is predicted according to the received images, reduced by a predetermined time until the critical state of the object is reached.
EFFECT: formation of the near-circular orbit of the spacecraft for observation of onshore facilities from the spacecraft taking into account the time for preparation for their critical states.
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