The seven chakras have an especially important role in yoga, Ayurveda, and Jyotish.
They are energy centers on which we can depend for the integration of the physical, psychical, and astral bodies.
Here is a purported connection of the seven chakras to neve plexi
There is quite a lot of other information on the chakra Wikipedia page that I highly recommend and will save you its summary.
Interestingly, there are various assignments out there for the important association of the grahas (Sun, Moon, and planets) to the chakras. For example, David Frawley in Ayurvedic Astrology proposes the following assignments:
Chakra 1: Saturn, 2: Venus, 3: Mars, 4: Sun & Moon, 5: Mercury 6: Jupiter 7: None (because it is too elevated).
Online, you can find other assignments, too. For example, a popular one is:
Chakra 1: Mars, 2: Venus, 3: Sun, 4: Moon, 5: Mercury, 6: Saturn, 7: Jupiter.
One that I rather like that follows the order of the rulers in the zodiac is
Chakra 1: Saturn, 2: Jupiter, 3: Mars, 4: Venus, 5: Mercury, 6: Sun & Moon, 7: None.
Now, some of these may exist contemporaneously as separate physical, psychical, or spiritual assignations. The field is quite open for discussion, with different swamis and gurus offering their own separate analyses and commentaries.
I figure, since there is a bit of a free-for all, I too will submit for your consideration my assignment and provide a bit of justification.
Chakra 1: Saturn, 2: Moon, 3: Sun, 4: Venus, 5: Mercury, 6: Mars, 7: Jupiter with Rahu representing the region below the root chakra (some Tantric sources refer to just such a chakra) and Ketu representing the space above the crown chakra (same).
Some of these assignments make basic sense.
The root (first) chakra as being associated with Saturn is no surprise. Both (when well-conditioned) represent rootedness, stability, and support.
The second chakra is strongly associated with the water element and so is the Moon. Both link to hormones, sensuality (as in of sense-based experience), and articulations of psychological mind.
The third chakra of the solar plexus makes an obvious connection to the Sun and its articulation of “I am”-ness among other more esoteric functions.
The heart (fourth) chakra makes similarly strong associations with Venus. Both are articulations of an unsteady peace based on affection, rhythm, and form among other more esoteric functions.
The throat (fifth) chakra is, among all the assignment systems, universally assigned to Mercury as both are associated strongly with expression and communication.
The subtle, slippery, and sophisticated third eye (sixth) chakra is in my assignment associated with Mars. This is perhaps the most superficially surprising association but remember that a well-conditioned Mars is spiritual hero of the battlefield (Aries) and the swamps (Scorpio) within us, and so, could be said to balance the second and third chakras, especially when they are ill-conditioned. The third eye is Agni (fire) based as well, and only Mars can offer that since Sun is occupied in the third chakra.
The seventh crown chakra seems to make a ready and easy association with Jupiter. Both are representative with ultimate knowledge and wisdom, steady peace, and joy.
Finally Rahu and Ketu are included in my associations as representing below the base (Rahu) and above the crown (Ketu), in keeping with their directions of downward and upward respectively. Their roles will be more obvious in the mathematical explanation below.
Further, the following is a mathematical analysis that may further support my assignments. Remember the last post about numerology? Refer to it for help with explaining these correspondences of number and graha.
A curious thing pops out: in a visually nesting form, chakras 1 and 7 add to 11 (the power number of numerology), so too do the next chakras within that, i.e., chakras 2 and 6, and then 4 and 5. It strikes me that Mars and Moon might even be swapped (a case can be made for that too), and still this relationship holds. The solar plexus third chakra retains unary oneness, appropriate to its association with the number 1, the belly button, and the Sun.
Even Rahu below chakra 1 and Ketu above chakra 7 add to 11 since Rahu is 4 and Ketu is 7.
Eleven is a mystical number for many reasons. For example, it is one done twice and so, represents the kingly Sun (one) and queenly Moon (2) united as monarchs of the kingdom, our kingdom, the solar system, and universe.
When we consider these graha combination pairs being activated by adding the Sun as significator of Soul and the fundamental of 11, we experience the number 12 which is:
· The basis of the holy number 108 (9x12),
· Another expression of the only regal luminaries, Sun (1) and Moon (2).
It is only this system of assignments that has such an emerging, internal pattern.
So, perhaps there is something extra valid here. I just am submitting it for your consideration. Let me know what you think.