Although little is documented on a personal level concerning the Mars Declination Cycle, it certainly proves useful for mundane Mars-related events.
You won't want to miss Kathryn's article on this important Cycle at Collaborate with Fate where you'll find information on this Declination Cycle which relates to all Mars-ruled things and events such as: war, the military and law enforcement, violence, industrial workers, banditry, fires/firemen, surgeons, manufacturing, accidents, explosions, sports such as boxing, and so on.
The Declination Cycle of a planet refers to its crossing of the celestial equator such as from South Declination to North Declination when it switches Polarity.
A chart is then set up for that time in a place of your choice, and the chart is used for transits and aspects relating to house positions, angularity to Mars, and the upcoming influences for any and all Mars-ruled things (but not to other planets in the Mars Declination Chart--only Mars.)
Kathryn gives dates, times, and examples so be sure to check out her excellent work.
She has also posted on the Saturn/Neptune Cycle which is now affecting Tony Blair (who has Sat/Nep conj natally--the tr Sat/Nep opposition is exact on June 27, the day he is scheduled to step down!), and on the Solar Cycle as well.
The Mars Cycle we're now in began June 20, 2005 at 3:22 GMT and is coming to a close in a few days with the next Cycle beginning May 20, 2007 4:37 GMT.