(on the name G. In. Vul"fa), the graph, which is the grid of the meridians and
parallels; transverse stereografich. the projection of
hemisphere on the plane. With the aid of v. s. graphically are
solved mn. of the task of sferich. of trigonometry, in particular
sferich. of astronomy. Convenience in the application of v. s.
is connected with the fact that ever larger and small circles of
sphere are depicted on it in the form of circles. It will
supplement, grafich. of construction usually is produced on the sheet
of tracing paper (tracing paper), which with the section operations
they turn around the center v. s. they adapt also by v. s., prepared
on the tracing paper. Lines on v. s. are conducted through 1-2°;
on the large grids - through 0,5°. On v. s. it is possible
to easily conduct arc of the great circle through the given points of
sphere and to count off angular distance between them; to build
sferich. triangle according to its any three elements and to determine
remaining elements; to accomplish a passage from one system of
sferich. of coordinates to another; to determine the moments of
rise and approach of celestial bodies, offensive of twilights;
to explain, is illuminated skills, Earth satellite with solar
rays, and mn. of others in the figure - determination of the
visibility conditions of the satellite above the horizon GG of the
station of observations s on two turns with the position of the knot
of orbit QI and Q2- points with the numbers - position of the
satellite through 5, 10 and Vol. d. min after passage through the knot. After turning tracing
paper to the combination of point s with the pole R, along the lines
v. s. the horizontal coordinates (height and azimuth) of satellite at
a given moment in time determine geo-centRICh. N.
p. yerpylev.
