Planetary friendship table (naisargika maitri)
The planetary friendship table (naisargika maitri) classes each graha as a natural friend, neutral or enemy of the others. It is used in the Parashari scheme to judge how well grahas get along.
What it is
The standard table: the Sun is friendly with Moon, Mars and Jupiter, neutral to Mercury, and hostile to Venus and Saturn. The Moon is friendly with Sun and Mercury, and neutral to the rest. Mars is friendly with Sun, Moon and Jupiter, and hostile to Mercury. Mercury is friendly with Sun and Venus, and hostile to Moon. Jupiter is friendly with Sun, Moon and Mars, and hostile to Mercury and Venus. Venus is friendly with Mercury and Saturn, and hostile to Sun and Moon. Saturn is friendly with Mercury and Venus, and hostile to Sun, Moon and Mars.
How it is worked out or read
Temporary friendship (tatkalika maitri) is found from the houses a planet occupies from another. It is combined with the natural table in some schools.
Where it appears on this site
The table is not yet used by the tools. The Ashtakoota matching, which uses graha maitri, is planned and is described on the graha maitri article.
The natural table in full
In the Parashari natural friendship table: the Sun's friends are the Moon, Mars and Jupiter, Mercury is neutral, and Venus and Saturn are enemies. The Moon's friends are the Sun and Mercury, and all others are neutral; the Moon has no enemies. Mars's friends are the Sun, Moon and Jupiter, Venus and Saturn are neutral, and Mercury is an enemy. Mercury's friends are the Sun and Venus, Mars, Jupiter and Saturn are neutral, and the Moon is an enemy. Jupiter's friends are the Sun, Moon and Mars, Saturn is neutral, and Mercury and Venus are enemies. Venus's friends are Mercury and Saturn, Mars and Jupiter are neutral, and the Sun and Moon are enemies. Saturn's friends are Mercury and Venus, Jupiter is neutral, and the Sun, Moon and Mars are enemies.
Relationships are not always mutual
The table is not symmetrical. The Moon counts Mercury as a friend, but Mercury counts the Moon as an enemy. The Sun counts Mercury as neutral, but Mercury counts the Sun as a friend. So when reading a planet in another's sign, always look up the relationship from the point of view of the planet occupying the sign: how does the guest regard the host?
Temporary and compound friendship
Besides the natural table, the texts describe temporary friendship, which depends on a particular chart. Planets in the second, third, fourth, tenth, eleventh and twelfth signs from a given planet are its temporary friends; those in the same sign or in the fifth to ninth are temporary enemies. Combining the natural and temporary relationships gives a five-fold compound relationship: great friend, friend, neutral, enemy and great enemy. The compound relationship is used in detailed strength calculations and in judging how comfortable a planet is in another's sign.