Chapter 4 - The various kinds of Strengths of Planets and Houses

If a planet is in his sign of exaltation he gets one Rupa of positional strength (Sthana Bala). He gets 3/4 of this strength in his Moolatrikona Rasi, 1/2 Rupa in his own sign and 1/4 Rupa in his friend's sign. He gets very little strength when he is in his enemy's sign. If a planet is in his sign of depression or is combust, he gets no positional strength at all.
source - phaladeepika

Chapter 4 - The various kinds of Strengths of Planets and Houses

Sthan Bala Contains twelve type of strength contributing factors or kinds of Sthan bala exist as follows :
(1) Uchcha Bala —A planet at his deep exaltation point, is allotted 1 Rupa (60 Shastayamsa). If he is at his deep debilitation point, his strength is nil. At the intervening positions the strength are given as follows. This is known as Uchcha Bala.

(2) If a planet is in his Moolatrikona Rasi he gets 36 Shastayamsa of strength. In the Rasi of Adhimitra he gets 22.5 Shastayamsa and 15 Shastayamsa if he is in the sign of a friend. He gets 7.5 Shastayamsa in a neutral Rasi, 3.75 in the Rasi of an enemy and 1.875 Shastayamsa in the Rasi of Adhishatru.

(3) He gets 30 Shastayamsa in his own Hora, 22.5 Shastayamsa in the Hora of Adhimitra, 15 Shastayamsa in the Hora of a friend, 7.5 Shastayamsa in the Hora of a neutral, 3.75 Shastayamsa in the Hora of an enemy and 1.875 Shastayamsa only in the Hora of a Adhishatru.

(4) He gets 30 Shastayamsa strength in his own decanate, 22.5 Shastayamsa in the decanate of an Adhimitra, 15 Shastayamsa in the decanate of a friend, 7.5 Shastayamsa in the decanate of a neutral, 3.75 Shastayamsa in the decanate of an enemy and 1,875 Shastayamsa in the decanate of Adhishatru.

(5) He gets 30 Shastayamsa in his own Saptamsa, 22.5 in the Saptamsa of Adhimitra, 15 in the Saptamsa of a friend, 7.5 in the Saptamsa of a neutral, 3.75 in the Saptamsa of an enemy and 1.875 Shastayamsa in the Saptamsa of an Adhishatru.

(6) He gets 30 Shastayamsa of strength in his own Navamsa. 22.5 in the Navamsa of an Adhimitra, 15 in the Navamsa of a friend. 7.5 in the Navamsa of a neutral, 3.75 in the Navamsa of an enemy and only 1.875 in the Navamsa of an Adhishatru.

(7) A planet gets 30 Shastayamsa of strength if he is in own Dwadasamsa, 22.5 in the Dwadasamsa of his Adhimitra, 15 in the Dwadasamsa of a friend, 7.5 in the Dwadasamsa of his neutral, 3.75 in the Dwadasamsa of his enemy and 1.875 in the Dwadasamsa of his Adhishatru.

(8) A planet gets 30 Shastayamsa in his own Trimsamsa, 22.5 in the Trimsamsa of his Adhimitra, 15 in the Trimsamsa of his friend, 7.5 in the Trimsamsa of his neutral, 3.75 in the Trimsamsa of his enemy and 1.875 in the Trimsamsa of his Adhishatru.

(9-10) (a) The Sun, Mars, Mercury and Saturn amongst those five whoever is in an Oja Rasi (viz. Aries, Gemini, Leo, Libra, Sagittarius and Aquarius) gets 15 Shastayamsa.
(b) Amongst the Moon and Venus, whoever is in Yugma (Taurus, Cancer, Virgo, Scorpio, Capricorn or Pisces) Navamsa, gets 15 Shastayamsas.

(11) A planet in Kendra Rasi gets 1 Rupa (60 Shastayamsa). That in a Panaphara Rasi gets 30 Shastayamsa and on an Apoklima Rasi gets 15 Shastayamsa.

(12) (a) Amongst the Sun, Mars and Jupiter whoever is in the first Drekkana gets 15 Shastayamsa of strength. In other Drekkanas they get no strength at all.
(b) Amongst Saturn and Mercury, whoever is in the 2nd Drekkana, gets 15 Shastayamsa of strength.
(c) Amongst the Moon and Venus, whoever is in the last Drekkana. gets 15 Shastayamsa of strength.

These 12 combinations are known as Sthan Bala. In Sanskrit they are called, (1) Uchcha Bala, (2) — (8) Saptavarga Bala, (9) Oja Yugma Rasi Bala. (10) Oja-Yugma navamsa Bala, (11) Kendradi Bala and (12) Dreshtakana Bala.
source - phaladeepika

Chapter 3 - Divisions of a sign

A planet is called Pradeepta (blazing) when he is in his sign of exaltation. He is Sukhita (happy) when he is in Moolatrikona Rasi. He is called Swastha (healthy) when he is in his own sign. He is Mudita (delighted) in a friendly house. He is Shanta (calm) when he has attained the varga of a benefic planet. He is Shakta (capable) when he shines brightly (not combust by being near the Sun). A planet is Vikala (distressed) when he is combust. He is Nipidita (troubled-tortured) when he is overcome in the planetary war by another planet. He is Khala (base) when he is in the varga of a malefic. He is Sudukhit (exceedingly unhappy), he is Atibheeta (very afraid) when he is in his sign of debilitation.

The planet in Pradeepta Avastha gives good effects In full. They will be nil when he is In Vikala Avastha. In the intervening Avasthas the auspicious effects will be decreasing proportionately and the inauspicious effects will correspondingly increase. The Avasthas of the planet will determine the effects according to the names given to them.

The good or bad effects in various Avasthas are approximately as given below :

Pradeepta — 100% good.

Sukhita — 80% good.

Swastha — 75% good.

Mudita — 60% good.

Shanto — 50% good.

Shakta — 40% good.

Nipidita— 40% bad.

Khata— 50% bad.

Sudukhito— 60% bad.

Atibheeta— 75% bad.

Vikala—100% bad.

The planets in good avasthas yield favourable effects in their Dasas and Antardasas. The reverse is the case with planets in adverse avasthas.
source - phaladeepika

Chapter 3 - Divisions of a sign

If we have to assess the comparative strength of a planet, we should find out whether he is in a kendra, trikona, in his own sign, in his moolatrikona sign, in his sign of exaltation or is vargottama. Then we should examine its portion in Dasavarga or Saptavarga. Some make the assessment only from Dasavarga, others assess the strength and auspiciousness of a planet from thirteen vargas.
source - phaladeepika

Chapter 15 - Assessment of houses

Should a planet own two houses, the effects of the house which is the Moolatrikona will predominate while the effects of his own house will be half.
source - phaladeepika

Chapter 20 - Effects of Dasas of the lords of houses and their Antar Dasas

If a benefic or a lord of a benefic house is posited in his sign of exaltation, he produces maximum good effects. The effects will be three-fourth if such a planet be in his Moolatrikona sign. It will be half if he be in his own sign. It will be one-fourth in a friend's sign, very little in his inimical sign and almost nil when it is in his sign of debilitation. In the case of malefics or lords of malefic houses the results will be reversed. When a planet is in combustion its effect will be similar to that in his sign of debilitation.
source - phaladeepika