We have seen that planets get power according to the signs they sit. Arranging in ascending order, it is debilitated/Neecha sign, Enemy sign, Neutral, Friendly sign, own sign(discussed in chapter 3 Lords of signs) and Exalted/Uchcha sign.
Apart from these levels of power, a planet gets 90 % power in certain signs. These signs are called Mool Trikon signs. Below table shows the mool trikon sign for each planet.
Mool Trikon Sign
If you notice there few planets get mool trikon sign in its own sign and some gets in their exalted sign. Now how to determine whether a planet in its own sign has 80% power or the 90% mool trikon power?
Sage Parashara clearly mentions that out of 30 degrees of a sign, a planet gets the mool trikon power only in certain degrees. Rest of the degrees would be own sign or exaltation sign.
Sun’s own sign is Leo. Like all other signs Leo sign has 30 degrees. Out of these 30 degrees only the first 20 degrees are mool trikon sign and rest 21 to 30 degrees are own sign.
Moon’s mool trikon sign is Taurus. If you notice Moon gets exalted in Taurus. It gets exalted in first 3 degrees of Taurus. Rest 27 degrees are mool trikon sign.
Mars gets mool trikon power in first 12 degrees. Rest 18 degrees are own house.
Mercury gets exalted in its own house and gets mool trikon power in same Virgo sign. Mercury gets exalted in first 15 degrees and next 10 degrees it is mool trikon and last 5 degrees it is own sign.
First 10 degrees of mool trikon sign and rest 20 degrees are own sign.
First 15 degrees of Libra mool trikon for Venus. Rest 15 degrees are own sign.
Frist 20 degrees of Aquarius is mool trikon and rest 10 degrees are own sign.
Virgo is mool trikon for Rahu
Pisces is moool trikon for Ketu.