Planets in signs and houses Difference between Lagnam and Rasi

Rasi of a child is calculated with reference to the position of Moon at the time of birth. If moon was travelling in the sky at a place called “Poosam” for example then the child is born in Poosa nakshatram, Kataka rasi. This is a broader calculation as Moon travels approximately for 2 ½ days in a rasi and approximately 25 hours in a nakshatram. That is all children born in this 25 hours are of same nakshatra and rasi.

Lagnam is the reference of the degree on which the Sun’s energy falls on a child at it rime of birth. This is a minute calculation and it changes every 2 hours approximately in day. So, all children born in this 2 hours duration is of same Lagnam. This is still fine tuned in Navamsa calculation by dividing this laganm - 2 hours by nine and putting it in the navamsa Chart. With this Navamsa Chart all the children born in about 12 minutes are of same category.