Difference between Rasi chart and BavaChalit chart

According to vedic astrology bhavchalit chart has to be studied along with Rasi chart. Rasi lagna chart predicts the personality of a person observed or behaved in common where as in bhavchalit chart denotes the unexpected behavior aspects of a person. Rasi chart has all the 12 houses equal to 0 to 30 degrees in length. Rasi chart is the main chart which explains about the sign of planets and ascendant. Rasi chart is used for understanding the planets whereas bhavchalit chart is used for understanding the houses. Most of the time planets are positioned in the same house in rasi and bhavchalit chart. However if planets change position in bhavchalit chart, astrologers should predict based on the principles of bhavchalit chart. Bhavchalit chart is used for predicting the house results where as signs in Rasi chart are used for transit analysis and tallying divisional charts.
    In case planets shift in the bhavchalit chart the dasa predictions can be implemented based on the planetary position in the bhavchalit chart. It is used for predicting the house results. Bhavchalit chart determines the dasa prediction based on the planet's effect placed in a particular house.
Sarvashtak varga SAV and bhinnashtak varga BAV use the house (bhav) of each planet rather than rasi. Aspect of planets, conjunction, debilitation and exaltation of planets and yogas are analyzed from rasi chart. Manglik dosha is partly studied from bhavchalit chart and partly from rasi chart.
    For example if venus is exalted in rasi chart in meena rasi and  in bhavchalit chart venus is moved on to mesha rasi, the native will be partially benefitted with exaltation effect. 

Transit of Saturn to Vrischika rasi

Saturn had an exalted stay in tula rasi for past two and half years which brought many changes in the world around. For instance atrocities faced by female gender with the effect of  saturn and rahu conjunction. When Saturn, Rahu and Mars conjunction took place in tula rasi there were many plane crashes and some countries in the East and Middle East had to face war like situations. There were major political changes in the East. There would be major relief for woman since rahu moved on to Virgo.
 On November 2nd November 2014 Saturn is moving forward to Vrischika rasi and will be residing in the same sign till January 26th, 2017. 

Sani is the naisargika karaka of suffering, past karma, crime, oppression, diseases, misery, defeat, hard work, servants, oil, labour, poverty, masses etc.
Sadesathi or 7 1/2 years saturn transit will be completed for kanya or Virgo rasi. Tula rasi will be moving forward for its last phase whereas Vrischika rasi enters the middle phase and dhanur rasi will begin its sadesati journey. Astama sani  effects begin to mesha rasi and  ardastama sani effects simha rasi from November 2nd 2014.
Sani is very slow moving planet and stays for a longer period in each rasi. Ardastama sani mostly produces separation or death of mother or her equals, unhappiness in family and separation for some, property issues.
Astama sani effects are humiliation, disgrace, loss of popularity, poverty, failures in many aspects of life.
Sadesati is a testing phase in every one's life. Saturn delay things and is a hard task master thus people learn patience and perseverance in a tough manner.  Care should be taken on account of marraige, profession, health, relationships, business, spirituality and in many more phases of life.