-
Tangent arcs are a type
of halo,
an atmospheric optical phenomenon,
which appears above and
below the
observed Sun or Moon,
tangent to the 22° halo. To...
-
functions of the
trigonometric functions (with
suitably restricted domains). Specifically, they are the
inverses of the sine, cosine,
tangent, cotangent...
-
arc between two endpoints,
there is at
least one
point at
which the
tangent to the
arc is
parallel to the
secant through its endpoints. It is one
of the...
- In geometry, the
tangent line (or
simply tangent) to a
plane curve at a
given point is, intuitively, the
straight line that "just touches" the
curve at...
- A
Parry arc is a rare halo,
an optical phenomenon which occasionally appears over a 22° halo
together with
an upper tangent arc. The halo was
first described...
-
An infralateral arc (or
lower lateral tangent arc) is a rare halo,
an optical phenomenon appearing similar to a
rainbow under a
white parhelic circle...
- and the
tangent functions.
Their reciprocals are
respectively the cosecant, the secant, and the
cotangent functions,
which are less used. Each
of these...
-
circles form the
subject of several theorems, and play
an important role in many
geometrical constructions and proofs.
Since the
tangent line to a
circle at...
-
Snowpine lift on
February 12, 2023 Long
exposure of a night-time
lunar halo display,
including an upper tangent arc, 22° halo, and
paraselenic circle A cir****scribed...
- rate
of change of the
surface normal around the curve's
tangent. Let the
curve be
arc-length parametrized, and let t = u × T so that T, t, u form
an orthonormal...
