Aero-Terms are designed to be a daily reminder of the terms,
names, acronyms and explanations of the unique language that
populates the aviation world. Aerospace, sport aviation, fixed
wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of
the terms you may use every day, or an introduction to an aspects
of the Aero-World you may not yet be familiar with. ANN also
encourages readers to go beyond the FMI link, and further research
any intriguing terms.
The slow rotation of the major axis of a planet's orbit in the
same direction as the revolution of the planet itself, due mainly
to gravitational interactions with other planets. A small
additional advance of the perihelion of Mercury, by 43 arcseconds
per century, was eventually explained as an effect of the general
theory of relativity.