Conjunction is [/B]the most powerful aspect because it indicates the same degree of the same sign for two planets. This aspect can be very intense and sometimes on the negative side, combustible. Conjunction expresses the creative energy of both planets involved.
http://www.indigoray.net/aspects.html#conjunction
By meditating and keeping your energies high, you can sublimate the negative energies. Mercury/Saturn conjunction makes one pessimistic focusing on the negative sides of life, prone to worry especially about the future and can cause anxiety from time to time. Vision, hearing and communication may or may not be affected, if sublimated these can turn for the better.
Never just look at one aspect alone, look at your entire chart. There can be offsetting aspects to this. Good thing from this aspect though is it makes a person hard working and disciplined.
Moon/Jupiter Conjunction on the other hand favors good relation with the mother, self-indulgence, generous and a love of family, home, friends and material possessions. Can become overly emotional and over react to things.
Conjunctions may show blockages or strengths to specific chakras especially if there are other signs and aspects to strengthen this for better or for worse.
Such as Mars/Saturn conjunction shows a blockage in the lower chakras, the energies may not flow freely as they should and since Mars rules the blood, there may be problems in regards to the blood circulatory system. There can be headaches. There can even be problems with the sexual energies. Again, look for other aspects that supports or offsets it.
you can learn more about astrology for yourself here:
http://www.angelfire.com/empire/serpent ... URCAS.html
http://www.angelfire.com/empire/serpent ... index.html
http://www.angelfire.com/empire/serpent ... ts666.html