Astro*Dictionary
by Michael Erlewine

2 articles for
"Increasing in Motion"

Increasing in Motion [Astro*Index]

A planet increases its angular velocity by acceleration as it approaches its periapsis (Perihelion or Perigee).

 

See also:

♦ Kepler's Laws ♦ Angular Velocity ♦ Periapsis ♦ Perihelion ♦ Perigee

 

Increasing in Motion [DeVore]

A planet increases its motion by accelera- tion from day to day as it approaches perihelion. When it is approaching its apogee, the Moon may advance 12° one day and as much as 13° the next. As its mean motion is 13°10' per day, any excess above this indicates that the Moon is "swift in motion." The condition is regarded as fortunate. Older authorities term it increasing in number.

 

See also:

♦ Kepler's Laws ♦ Angular Velocity ♦ Periapsis ♦ Perihelion ♦ Perigee