FIELD: aircraft engineering.
SUBSTANCE: invention relates space engineering. Proposed device comprises celestial globe with starry sky plotted thereon, two rings covering said globe with their centres aligned with that of the globe, and circular element, its projection on globe surface making a circle confining globe surface circular segment with angle of semi-span graduated from globe centre to that of said segment and equal to angle of semi-span of disc planet located at the centre of visible from spacecraft nearly circular orbit and visible from spacecraft. First ring is secured above globe pole points to allow revolution of said first ring about globe rotation axis. Second ring is secured to first ring. Second ring plane makes with globe equator plane the angle equal to that of spacecraft orbit inclination. Besides, guide pin is added to proposed device to envelop the globe, its centre being aligned with globe centre, and fitted along ecliptic line marked on globe surface, as well as means to fix the position of circular element with circular contour relative to circular guide pin.
EFFECT: expanded performances.
3 cl, 3 dwg
