FIELD: physics; cosmonautics.
SUBSTANCE: choice device of astronomical objects under observation from orbital spacecraft (SC) includes stellar globe, ring embracing the globe with aligned ring and globe centres and fixed over globe poles and rotating round globe rotation axis, the second ring embracing the globe with aligned second ring and globe centres and fixed on the first ring in crosspoints of the first ring and globe equator plane and rotating to position of the angle between second ring and globe equator plane equal to the angle of SC orbit dip angle. Additionally there are two elements with contour projection to globe surface forming circles and globe centre direction forming straight line passing through globe centre and perpendicular to the second ring plane, the angle equal 90° minus one-half angle of planet disk visible from SC round which SC moving in semi-circular orbit turns. Elements are fixed over globe surface from its opposite sides with one or more arches connecting introduced elements with the second ring. In addition each newly introduced element is designed in the form of translucent spherical segment one-half angle of which angle is equal 90° minus one-half angle of planet disk visible from SC, with slot provided from spherical segment edge to its centre arch length of which is equal or more then one-half angle of spherical segment minus SC orbit dip angle. Spherical segments centres lay on straight line passing through globe centre and perpendicular to the second ring plane with aligned centre of sphere forming spherical segments and globe centre. Slots in spherical segments are opposite to different globe poles. In addition each newly introduced element is constructed as ring placed on ruptured element contour. Ring segments opposite different globe are removed within ring rupture points.
EFFECT: provided display on stellar globe of regions observable from spacecraft during the whole orbit pass.
3 cl, 5 dwg.
