While reading a Horoscope the very first thing we look is how planets are related to each other. Any Rajyoga simple or special rajyoga and Dhanyoga can only happen when planets are involved with each other and there are few ways planets makes relation with each other. Ideally, these relations should happen between auspicious house lords and malefic house lord shouldn’t make relation with these auspicious lord i.e Kendra & Trine houses.
I have classified these planetary relations in two categories:
Conjunction is most known and a frequent occurrence in horoscopes.Conjunction can be btw many planets but more than three or four planets making conjunction is kind of rare. The conjunction of two planets is most common kind of conjunction in horoscopes.
You can see in example horoscope no.1. MOON and Venus are in 7th house, where Venus lord of 4th house and Venus is lord of 7th house itself.
Mutual aspect between planets is also a common occurrence and can happen in following manners.
1. DIRECT MUTUAL ASPECT: Here, two planets are placed 7th house away from each other which means they are exactly opposite to each other. Check example horoscope no.2 where Saturn and Jupiter are in Mutual aspect creating Dharmakarmadhipati Yoga.
2. INDIRECT MUTUAL ASPECT: This applies to planets which have additional aspect i.e Jupiter, Mars and Saturn. Check example no 3. horoscope for a better understanding of Indirect mutual aspect.
Here Mars is in 6th house and Saturn is in 9th house. Mars is aspecting Saturn via his 4th aspect and Saturn is aspecting Mars via its 10th aspect. This makes mutual aspect relation with them and is ignored by most beginners of astrology.
Planets in Kendra, which means planets in conjunction, 4th house, 7th house and 10th house from each other will be related to each other and it is an advanced version of conjunction and mutual aspect.This also is ignored by beginners of astrology and it’s importance can be understood from Gajakesari Yoga, where the vital conditions for it is Kendra relation between Moon and Jupiter. This explains why planets in Kendra house are related to each other.
Check example horoscope NO.4 which belongs to Shri K.N Rao here Moon is in ascendant and Jupiter is in 10th house creating Gajakesari Yoga.
This Kendra relationship serves very well with the natural signification of planets like Moon-Venus in 1 – 10 from each other and will give benefits or career in the art field. Same way Mars in ascendant and Saturn in 10th is good for property. I have Mars in ascendant and Saturn in 10th house and I inherited a good amount of lands from my father.
Though not much popular in Parashar astrology but frequently used in Nadi astrology. Here, planets should be in trine with each other. Here, trine means 5th or 9th from each other.
In example horoscope no.5, Mars is in ascendant and Moon is in 9th house, which means Mars is 5th house away from Moon and Moon is 9 house away from Moon. Which makes Mars and Moon trine to each other.
This is the strongest relationship two planets can have. This is quite easy to detect but requires skills to makes interpretation of them. It is formed when two planets are in each other signs. Suppose Venus is in Virgo and Mercury is in Libra here, they are in each other sign and exchange relation will be established.
The other famous example of exchange in horoscope belongs to the first female prime minister of India and you can see three exchange in her horoscope.
I have written a detailed article on the exchange between planets which you can refer for the complete understanding of it.