Are you sure there is nothing to astrology??

[aidbo]

43. Astrology is BS. Astronomy is not.

The effect of Jupiter's gravity on the earth is not zero, but it is negligible. Jupiter's main effect on Earth is that it tends to pull in rogue asteroids and thereby reduce the number of asteroids that could threaten Earth. Of course it could also change the orbital trajectory of formerly 'safe' asteroids and cause them to threaten earth.

This page does a decent job of explaining the pull of other planets on the earth.
http://scienceline.ucsb.edu/getkey.php?key=3396

Answer 1:
Other planets have almost no effect on Earth's gravitational pull. All objects (including planets) are attracted to each other by the force of gravity. How strong this attraction is depends on the size of the objects (mass) and how far apart they are. Earth's gravitational pull on an object depends only on how far away that object is and the mass of that object. The total gravitational pull that the object feels could be affected by other large objects nearby, but because the other planets are very far away, the strength of that gravitational attraction is extremely small and can be ignored.

Even though the sun is also very far away its gravitational pull on the planets (including Earth) is much stronger than the pull of the planets on each other because it so much larger than any of the planets. (The sun is over 1000 times more massive than Jupiter and over a million times more massive than Mars). So all of the planets (Earth included) travel around the sun in elliptical (that is, nearly circular) orbits. A planet's orbit can be very slightly changed by the gravitational pull of another large relatively nearby planet. This small effect will be greater the farther the planets are from the sun, the closer they are to each other and the larger they are. Although this effect is very tiny, it can be measurable. In fact, before Neptune was discovered, 19th century astronomers noticed irregularities in Uranus’s orbit and realized that this was a result of the gravitational pull of a planet beyond Uranus (i.e. Neptune). They were even able to correctly calculate where this “new” planet should be.

The sun and moon both affect Earth's tides, the sun has a smaller effect because it's so much further away. Sometimes the tides are pulling in the same direction and magnify each other (called spring tides). Sometimes they pull in orthogonal directions and tides are smaller (called neap tides).

Here's a neat GIF of tides and Earth.