They call it the impossible turn.

Ricky wrote
You are so wrong.
You do not fly, have never had any flight training, and anything that
comes from you should not be taken seriously.

NO Ricky....YOU are so wrong...It will probably come as quite shock to
you to find that the FAA will issue a Basic Ground Instructor
Certificate, an Advanced Ground Instructor Certificate, and an
Instrument Instructor Certificate to individuals who have never set foot
in an aircraft. Being a pilot is not a requirement to teach aviation
subjects to prospective pilots.

Robert Moore
PanAm Retired
ATP ASMEL...B-727 B-707 L-188
USN S-2 P-2 P-3
CFI CFII AGI IGI

From The FAR.....

To be eligible for a ground instructor certificate, you must
Be at least 18 years of age.
Be able to read, write, and converse fluently in English.
Exhibit practical and theoretical knowledge by passing the Fundamentals
of Instructing (FOI) and the appropriate ground instructor knowledge
tests.

Ground instructor certificates cover three levels of certification:
Basic ground instructor (BGI) may provide
Ground training in the aeronautical knowledge areas required for a
recreational or private pilot certificate
Ground training required for a recreational or private pilot flight
review
A recommendation for the recreational or private pilot knowledge test
Advanced ground instructor (AGI) may provide:
Ground training in the aeronautical knowledge areas required for any
certificate or rating
Ground training required for any flight review
A recommendation for a knowledge test required for any certificate
Instrument ground instructor (IGI) may provide:
Ground training in the aeronautical knowledge areas required for an
instrument rating to a pilot or instructor certificate
Ground training required for an instrument proficiency check
A recommendation for the instrument rating knowledge test for a pilot or
instructor certificate