OPTICAL TELESCOPE Russian patent published in 2014 - IPC G02B23/00 G02B17/06 

FIELD: physics.

SUBSTANCE: telescope includes a housing (1) in which there is an optical system which comprises a main concave hyperbolic mirror (2) with a centre opening (3), a secondary convex hyperbolic mirror (4) and a photodetector (5), placed in the focal plane of the telescope. The housing (1) is provided with a semi-cylindrical sun-screening blind (7) placed at the entrance pupil (6) of the telescope and capable of being rotated by a drive (8) around the optical axis of the telescope. Solar cells are mounted on the edges of the inner surface of the semi-cylindrical sun-screening blind (7) to transmit a signal to the drive (8) thereof. The length L of the semi-cylindrical sun-screening blind (7) satisfies the relationship: L=D/tgα, cm; 7°≤α≤70°; where D is the diameter of the entrance pupil of the telescope, cm; α is the angular distance between directions towards the centre of the Moon and the edge of the Sun closest to the Moon.

EFFECT: systematic high-precision measurements of time variations of surface brightness of the dark part of the moon and the bright sickle moon.

3 cl, 4 dwg