Apoapsis
The greatest radial distance of an Ellipse as measured from a Focus. Taking 
in the equation of anEllipse
gives the apoapsis distance
Apoapsis for an orbit
around the Earth 
is called apogee, and apoapsis for anorbit around the Sun is called aphelion. See also Eccentricity, Ellipse, Focus, Periapsis- Partial Latin Square
- Partially Ordered Set
- Partial Order
- Partial Quotient
- Particularly Well-Behaved Functions
- Partisan Game
- Partition
- Partition Function P
- Partition Function Q
- Part Metric
- Party Problem
- Parzen Apodization Function
- Pascal Distribution
- Pascal Line
- Pascal's Formula
- Pascal's Hexagrammum Mysticum
- Pascal's Limaçon
- Pascal's Rule
- Pascal's Theorem
- Pascal's Triangle
- Pascal's Wager
- Pasch's Axiom
- Pasch's Theorem
- Pass Equivalent
- Pass Move