Importance of chandra Kundali/Moon chart

Moon is said to be the Lamp post of Destiny, the day to day predictions are given based on the position of moon. There is a great importance of Chandra kundali/Moon chart in astrology. The Astrologers of Old generation always used to draw chandra kundali/moon chart next to your lagna chart, such is the importance of moon chart. Why did they draw chandra kundali next to lagna kundali ? What is the importance of chandra kundali/moon chart ?