  A problem of constructing the trajectory of a spacecraft flight to Venus
within the framework of a mission including landing of a lander in a given
region of the planet's surface is being considered. A new celestial mechanics
related method based on the use of gravity assist maneuver near Venus is
proposed to transfer the spacecraft to a heliocentric orbit resonant with the
orbit of Venus, so that, at the next approach the planet, the given region of
the surface becomes attainable for landing. It is shown that the best resonant
orbit in terms of the cost of the characteristic velocity is an orbit with a
1:1 ratio of the period to the orbital period of Venus. A procedure for
choosing one of possible resonant orbits depending on coordinates of the
desired landing point on the surface and the launch date of the mission is
described. An example of calculating the flight trajectory that ensures landing
in the Vellamo-South region of the Venus surface at launch from the Earth in
2031 is considered.
