PER meaning in Space Science ?

Answer: What is Perigee mean?

An apsis (plural apsides AP-sih-deez, from Greek "orbit") is the farthest or nearest point in the orbit of a planetary body about its primary body. The apsides of Earth's orbit of the Sun are two: the aphelion, where Earth is farthest from the sun, and the perihelion, where it is nearest. "Apsides" can also refer to the distance of the extreme range of an object orbiting a host body.

reference

Full Form	Category
IEEE Power Engineering Review	Academic & Science
Performance Evaluation Reports	Academic & Science
Price-to-earnings Ratio	Accounts and Finance
Perth	Airport Code
Post Execution Reporting	Business
Price Earnings Ratio	Business
Perot Systems Corporation	Business
Process Energy Requirement	Business
Planning, Evaluating, and Reporting	Business
Packed Encoding Rules	Computer and Networking
Parameter Error Rate	Computer and Networking
Program Editor Resident Area	Computing
Predictive Error	Computing
Post Error	Computing
Probable Error	Computing
Provider Edge Router	Computing
Program Event Recording	Computing
Program Editor Resident Area (wordperfect Library)	File Type
Pretty Erroneous Ringtone	General
Price Earning Ratio	General
Private Equity Recruitment	General
Processing Equipment Repair	General
Patientens Egen Registrering	General
Portfolio Efficiency Ratio	General
Power Equipment Rack	General
Practical Experience Requirement	General
Public Emergency Regulations	General
Pulley End Right	General
Porsche Engineering Romania	General
Prescricoes Especificas de Ralis	General
For Every	General
Prisoner Escort Record	Governmental
Pharmaceutical Evaluation Report	Governmental
Public Expenditure Review	Governmental
Periodic Electoral Review	Governmental
PERAMBUR	Indian Railway Station
Plan de Empleo Rural	International
Plan de Energías Renovables	International
Partial Equivalence Relation	Maths
per - by or through	Medical
Protein Efficiency Ratio	Medical
Progressive Endurance Run	Military and Defence
Personnel	Military and Defence
Perform	Military and Defence
Packet Error Rate	Military and Defence
Packet Encoding Rules	Networking
Physics Education Research	Physics Related
Perth Airport	Regional
Port Everglades Railway	Regional
Perth, Western Australia, Australia	Regional
Persian	Regional
Lads On Tour	Softwares
Position Error Recovery	Space Science
Premature Engine Removal	Space Science
Pyrotechnic Energy Release	Space Science
Perigee	Space Science
Period	Space Science
Preliminary Engineering Report	Space Science
Player Efficiency Rating	Sports