FIELD: aviation.
SUBSTANCE: device to select astronomic objects of surveillance from an orbital spacecraft (SC), includes a globe with an applied sky map, two rings covering the globe, centres of which are matched with the centre of the globe, an element with a circular contour, the projection of which to the surface of the globe forms a circumference that limits the segment of the globe surface with an angle of semi-opening counted from the direction from the centre of the globe to the centre of the specified segment of the globe surface, equal to the angle of semi-opening of a disc visible from the SC in the planet located in the centre of the near-circular orbit of the SC, and an arc element connected with the specified element with the circular contour. The first ring is fixed above points of globe poles with the possibility to rotate a ring around the axis of globe rotation. The second ring is fixed on the first ring. The plane of the second ring makes an angle with the plane of the globe equator equal to the angle of SC orbit inclination. In addition the size of the arc element arc measured from the centre of the globe is equal to 180°-Q, where Q - angle of semi-opening of the planet disc visible from the SC orbit. The arc element with its end point is rigidly connected with the edge of the element with the circular contour. The arc element and element with the circular contour are made as detachable and equipped with a facility of their fixation on the globe in positions, in which the free end point of the arc element and the centre of the element with circular contour are at the same diameter of the globe.
EFFECT: expansion of device functional capabilities.
2 cl, 2 dwg
