The following principle may be
easily adopted in understanding the planets and to know which are enemies or friends of a particular planet.
MarsIf you have a look at the celestial map of the Heavens, you will find that certain planets are placed in certain positions in relation to each other. For instance, taking Aries
as the first sign of which the lord is Mars, we find that Mercury, a natural benefic, has Rashis which are the 3rd and 6th from Aries. Therefore, Mercury becomes an enemy of Mars.
Even from Scorpio, which is owned by Mars, Mercury owns the 8th and 11th houses from Scorpio. The 3rd, 6th, 8th and 11th houses are definitely bad. From Gemini, Mars becomes the
lord of the 3rd and 8th houses. Therefore, the common position of the 3rd, 6th and 8th, which are all inauspicious, affect the two planets. Therefore, Mars and Mercury are inimical.
From Aries, the Sun becomes the lord of the 5th house, and therefore a friend. From Scorpio, he is the lord of the 10th house. From Leo, Mars becomes the lord of the two benefic
houses, 4th and 9th. Therefore, the Sun and Mars are friends.
From Aries, the Moon is the lord of the 4th house and from Scorpio, the Moon is the lord of the 9th house. From Cancer, Mars becomes the lord of the 5th and 10th houses. Therefore,
the Moon and Mars are friends.