- or meridians.
Small circles on the
sphere that are
parallel to the
equator are
circles of
latitude (or
parallels). In
geometry unrelated to astronomical...
- be
generated by the
intersection of the
sphere with a
plane parallel to a
plane through the
center of the
sphere. If l, m, n are
three distinct lines, then...
- infinite-radius
celestial sphere will be
looking along parallel lines, and
observers looking toward the same
great circle,
along parallel planes. On an infinite-radius...
- In mathematics, an n-
sphere or
hypersphere is an n {\displaystyle n} -dimensional
generalization of the 1 {\displaystyle 1} -dimensional
circle and...
-
astronomical coordinates specify the
location of a
point on the
celestial sphere in the
equatorial coordinate system. An old term,
right ascension (Latin:...
-
chord of the circle. Both
definitions are also
valid for the
diameter of a
sphere. In more
modern usage, the
length d {\displaystyle d} of a
diameter is also...
-
interior of the
sphere.
Parallel planes cut the
sphere into
parallel (concentric)
small circles; the pair of
parallel planes tangent to the
sphere are tangent...
- In mathematics, a
hypersphere or 3-
sphere is a 4-dimensional
analogue of a
sphere, and is the 3-dimensional n-
sphere. In 4-dimensional
Euclidean space...
-
points on a
sphere representing them are antipodal, at the two
opposite ends of a
common diameter. Two
directions are
parallel (as in
parallel lines) if...
- In mathematics, the
Riemann sphere,
named after Bernhard Riemann, is a
model of the
extended complex plane (also
called the
closed complex plane): the...
