Semilatus Rectum
Given an
Ellipse
, the semilatus rectum is defined as the distance
measured from a
Focus
such that
(1)
where
and
are the
Apoapsis
and
Periapsis
, and
is the
Ellipse
's
Eccentricity
. Plugging in for
and
then gives
(2)
so
(3)
See also
Eccentricity
,
Ellipse
,
Focus
,
Latus Rectum
,
Semimajor Axis
,
Semiminor Axis
© 1996-9
Eric W. Weisstein
1999-05-26