From the link you gave, etaoin, the frequency of flashes is influenced somewhat by rotation
of earth:Over the course of a night, it will be noticed that more sporadic meteors can be
seen in the hours before sunrise than in the hours after sunset. This is due to the motion
of the Earth as it revolves around the sun, with the leading edge (morning side) of the Earth
encountering more meteoroids than the trailing edge (evening side). In general, 2 to 3 times
as many meteors can be seen in the hour or so just before morning twilight, than can be
seen in the early evening. Additionally, the numbers of random, or sporadic meteors will
also vary from season to season, due to the tilt of the Earth on its axis and other factors.
As a general rule, about 2 to 3 times as many sporadic meteors can be seen in the early
fall (September) as can be seen in the early spring (March). Together,these two effects
can generate a fluctuation in the hourly rate of sporadic meteors by a factor of 4 to 9 times,
over the course of the year.
But difference in trajectories that Wordwind was interested in seems to be quite small.
