Rahu is said to be strong, when posited in Mesh, Vrishabh, Kark, Vrischik, or Kumbh, or, when yuti with Sūrya, or Candr, during Parivesh and at the end of a Rāśi i. e., when he starts his journey in a Rāśi).
Notes: Rahu is strong in Mesh, Kanya, Vrishabh, Vrischik and Kumbh. He is also strong in Karm Bhava. (Jataka Parijata Ch. II)
Ketu has strength in the second portion of Dhanu. He is also strong in Meen, Kanya and Vrishabh and in night, or, when a rainbow, or a meteor is noticed.
Notes: Ketu is strong in Kanya, Meen, Vrishabh and Dhanu and, when a rainbow, or a meteor is noticed (Jatak Parijata).
The Rāśis Mesh, Simh, Dhanu and Meen give strength to Sūrya, if they happen to rise, or be on the meridian simultaneously. In other Bhavas, he is weak.
Notes: Should Sūrya be in the said Bhavas, which happen to be Lagn, or Karm Bhava, he is strong. In other Bhavas, as Lagn, or Karm Bhava, he is not so good.
Slokas 20 to 29 deal with the strength of the Grahas ih the various Rāśis, which should simultaneously be that particular Bhava in the Kundali.
Candr is strong, if she is in Mithun, Kanya, or Dhanu coinciding with Lagn. She is strong in Yuvati Bhava, if it is Meen, or the first half of Dhanu. If she is in Vrishabh, or in the latter half of Dhanu, as Yuvati Bhava, or Karm Bhava, as the case may be, she is strong. Similarly, when in Kark, or in Mithun, as Bandhu Bhava, she has strength.
Notes: For Kanya Lagn, Candr in Yuvati Bhava in Meen, or for Vrischik Lagn in Vrishabh in Yuvati Bhava, for Mithun Lagn, in Yuvati Bhava in the first half of Dhanu, for Meen in Bandhu Bhava in Kark, is said to possess strength.
Mangal is strong in Lagn identical with Kumbh, or in Yuvati Bhava, if it is Kark, or Vrischik. He is strong in Karm Bhava in the first half of Makar, or in Mithun and in Bandhu Bhava, if in the second half of Dhanu. He is similarly strong, when his brightness is not obscured, or, when he is in Dharm in his own Bhava.
Notes: Mangal, though in fall in Kark, is good in Yuvati Bhava in the case of Makar natives. Should he in such a case join Śani, he blesses the subject with a beautiful and chaste wife. Further, Bandhu and Yuvati Bhava placement of Mangal, as per the above Sloka shall not give rise to Kuja dosha. For Simh and Meen Lagnas, the Grah is good in Dharm Bhava and will not cause bad effects for the father of the native.
Budh is strong in Lagn, if in Makar, Simh, or Kark. He is also strong in his own divisions. Should Dhanu hold Budh in Bandhu Bhava, then too he is strong. Similarly in Vrishabh, as Yuvati Bhava, or in Meen, as Karm Bhava.
Notes: Should Makar be Lagn and be occupied by Budh, his blemish of Ari’s lordship is mitigated and simi]arly Vyaya’s lordship, if in Kark Lagn. For Mithun Lagn, though he will be fall in Karm Bhava, he will prove auspicious. Guru has strength in Simh, Vrishabh, Mesh, Dhanu, Vrischik and Meen, if one of these happens to be Lagn, or Bandhu, or Karm Bhava of the horoscope. Otherwise he is weak.
Notes: Guru rules Randhr Bhava for Vrishabh Lagn. Hence, he is adverse for longevity, if he is in Vrishabh, when it rises in the horoscope. In such circumstances, Śani should be strong lest the native is short lived. Or otherwise, Śukr should be stronger than Guru.
Dr. B.V. Raman, a powerful Jyotishi has Guru in Karm Bhava in Vrischik.
Śukr possesses strength in Simh, Mesh. Kumbh and Vrischik, if these happen to be Lagn; similarly in Yuvati Bhava, if at the end of Dhanu, or in (the whole of) Vrischik.
He is strong in the first half of Dhanu in Karm Bhava. Karm Bhava position in Meen, Simh, or Vrischik is also good. He is strong also in Bandhu Bhava in the second half of Makar. He is strong, if he wins in a war between Grahas.
Śani is strong in Kumbh, or Tula, if they happen to rise, or be Bandhu Bhava. Similarly he is strong in Karm Bhava in Simh, or in Yuvati Bhava in a Rāśi, that does not rise with hind part.
Notes: The risings of Rāśis have already been explained in the opening Ch.. Now, I give below the details of Grahodaya, or risings of Grahas: 1) Sūrya, Rahu, Mangal and Śani rise with hind part and hence called Prishtodaya Grahas. 2) Candr, Śukr and Budh rise with their heads and hence called Shirshodaya Grahas. 3) Guru rises in both ways and hence Ubhayodaya Grah.
The Dasha of a Grah in that particular class of Rāśi will be beneficial. Suppose a Grah, that rises with its head is in a Shirshodaya Rāśi, then the Dasha concerned will be auspicious.
Śani is strong, if he is in Tula Lagn; see notes under previous Sloka.
Budh and Guru in Lagn, Candr and Śukr in Bandhu Bhava, Sūrya and Mangal in Karm Bhava and Śani in Yuvati Bhava enjoy Dig Bal, or directional strength. According to Yavanas, all the Grahas are devoid of strength in Apoklima Bhavas (Sahaj, Ari, Dharm and Vyaya Bhava), have medium strength in Panaphara (Dhan, Putr, Randhr and Labh Bhava) and are strong in Kendras (Tanu, Bandhu, Yuvati and Karm Bhava).
Notes: Directional strength makes a Grah confer good results during its Dasha Bhuktis. In the opposite Bhava with reference to such Rāśis, the Grah has no Dig Bal. For example, Sūrya has Dig Bal in Karm Bhava. Should he be in Bandhu Bhava, his Dig Bal is nil. For full details on such calculations, please see Dr. B. V. Raman’s Graha and Bhava Balas, or Sripathi Paddhati, English translation by Shri V. S. Shastry.