Like the Moon, asteroids can wax and wane, depending on their position relative to the Sun.

BBC: Asteroid thought to kill dinosaurs may not be guilty

Just understand how sectors tend to wax and wane over a full economic cycle.

FORBES: Watch your sectors

The symptoms of IBD tend to wax and wane, but can seriously debilitate some patients.

BBC: News | Health | Bowel disease drug breakthrough

Like the British Empire, however, the seafaring group is bound to wax and wane over time.

FORBES: Magazine Article

He would watch the daylight wax and wane on the ceiling, or roaches creep slowly up the wall.

NEWYORKER: Hellhole

Various publications wax and wane in their call for cartoons, and this normally relates directly to the editors mind-set.

FORBES: Move up http://i.forbesimg.com t Move down

Meanwhile the natural body clock was disturbed - some genes naturally wax and wane in activity through the day, but this effect was dulled by sleep deprivation.

BBC: Bad sleep 'dramatically' alters body

By allowing their exchange rates to rise and fall as capital flows wax and wane, emerging economies should be able to keep a measure of control over their domestic monetary conditions.

ECONOMIST: Charting a different course | The

They wax and wane, and sometimes become completely inactive.

FORBES: Communicating Risk: How Not To Do It

That was another challenge for the astronomers: Because they didn't know the asteroid's rotation period, they didn't know when it would wax and wane, and when it would grow too faint to see.

CNN: Phew! Asteroid to miss Earth in 2040, NASA says

The fashion for skiing will wax and wane.

ECONOMIST: Lexington: Salt Lake City’s new image | The