Lagna Chart & Bhava Chalit Chart
Lagna Chart assumes that all the houses are equal to 30 degrees in length. While calculating the positions of ascendant and other planets, we just take the modulo of the degree by 30 and assign the houses. In Bhava Chart, the mid point of a house, i.e. the bhava madhya, is given a lot of importance. The influence of a house is calculated based on this bhava madhya.
Normally, Bhava Chalit Chart and Lagna Chart would agree with each other. However, if the Ascendant or planets’ degree is closer to multiple of 30, there may be differences between the charts. It is always interesting to see if a planet has moved from one house to another house from Lagna Chart to Bhava Chalit Chart. This explains a lot of times why a yoga that is so obvious in Lagna Chart does not fructify in real life.
In Lagna Chart we see sign and aspects a planet will have, in Bhava Chalit Chart we see houses. So, Planets in 1st and 10th house in Lagna Chart getting shifted in the previous 12th and 9th house will be in 12th and 9th house but in the signs of 1th and 5th house and its aspects. Example. Saturn in 10th house in cancer in Lagna Chart getting shifted in previous 9th house will be in 9th but in cancer sign and its aspect will be 12,4,7th houses.
Bhav Chalit Chart is used for predicting the house results. Signs in Lagna Chart are used for transit analysis and for tallying divisional chart. The aspects of planets on other planets are always studied from Lagna Chart. Similarly exaltation/debilitation of planets is again studied only from the Lagna Chart.