Over longer periods of time, the dust trails can evolve in complicated ways.
These meteors can produce bright dust trails that last for several seconds. The shower usually peaks on April 21 & 22, although some meteors can be visible from April 16 - 25.
Christou and his colleagues have developed a model to predict meteor showers caused by the intersection of Mars with dust trails from comet 79P/du Toit-Hartley.
He also discovered dust trails extending 4.20 arc minutes to the east and 6.89 arc minutes to the west and tails extending about 1 arc minute from elements of the nuclear train. Bureau director Brian G.
Their mathetical model calculates the braided structure of dust trails left by the comet on previous orbits of the Sun, allowing them to predict meteor activity to an unprecedented accuracy of five minutes.
 See also: Sky, Night, Earth, Second, Time
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