2 articles for "Increasing in Motion"

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

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