how does the position of planets affect humans ?

Planets especially moon's position will affect us. Since the Moon is orbiting the Earth, as usual. The Moon, being a massive body, has a gravitational field. But that gravitational field isn't uniform. It's stronger closer to the Moon, and weaker further from the Moon. That means the part of Earth nearest to the Moon experiences a greater gravitational pull, and the part of Earth furthest from the Moon experiences a weaker gravitational pull. This lopsided gravitational pull causes the region nearest to the Moon to bulge outwards (towards the Moon), and also causes the region furthest from the Moon to bulge outwards (away from the Moon). As the Earth rotates, the point on Earth's surface which is closest to the Moon traces a circle around the Earth. That's why there are two oceanic tides each day. These tidal forces affect land and water alike. However, since water is a liquid, the water sloshes around a lot more than the land .You are affected by tidal forces as well, because the blood at your vessels is also liquid.
It affects blood pressure producing higher level of pressure and in stimulating the blood circulation, so the sexual craving is excited. Also some western countries suffer much from the increase in the rate of crimes and assaults in nights and days of the full-moon. Because of blood pressure which has the tendency to affects the mentality of someone till make them feel the angerness and other negative thoughts which will leads to misbehave such as mysterious murders ...!