evection

n.

（由太阳引力造成的）出差，月动差；

1. My friend went to Beijing on evection.
   一个学生把我的朋友去北京出差了。
2. By the way , tomorrow I will have evection for a week.
   顺便说一下，明天我要出差一个星期！

Evection
The evection resonance: solar and oblateness perturbations
Evection Resonance and the Angular Momentum of the Earth-Moon System
Debris dynamics under evection and inclination
About the dynamics of the evection resonance
On the Evection Resonance and Its Connection to the Stability of Outer Satellites
The Role of Evection in Optical Measurements of Light Beam Deflection from the Sun's Disk (the Einstein Effect)
A Study of Military Construction Productivity-A steel evection case study
Disruption of planetary orbits through evection resonance with an external companion: circumbinary planets and multiplanet systems
On Horrocks's Treatment of the Evection and the Equation of the Centre, with a Note on the Elliptic Hypothesis of Albert Curtz ...