Past life connections can be seen within a Synastry chart of two people.
The SouthNode in a chart is the prior point for finding past life connections.
Saturn is another very important significator of past life, “the father of time”.
To have a past life connection with someone, isn’t always positive, sometimes the two of you meet up again to pay the karmic debt, and finish the job together in this lifetime.

In synastry 
• Conjunction to Saturn, Moon
• Conjunction to Chiron, Ceres, Juno
• Planets in the 8th or 12th house
• Southnode in 4th, 8th, 12th house
• Conjunction to Southnode
• Southnode conjunct an angle
• Retrograde planets in 4th, 8th, 12th
• Chiron in aspect to Southnode (conjunct = strongest)
• Saturn conjunct Sun, Moon, Mercury, Venus, Mars

Past life connections through Synastry :

SN-Sun = Father, child, employer, employee, brother, cousins
SN-Moon = Mother, child, wife, sister, familymember
SN-Mercury = Neighbor, acquaintance, siblings
SN-Venus = Lover from past life, affair
SN-Mars = Sexual partners
SN-Jupiter = Teacher, student
SN-Saturn = Authority figure, father, teacher
SN-Uranus = Influencer
SN-Neptune = Spiritual teacher/healer
SN-Pluto = Controlling figure
SN-Juno = Spouse from past life
SN-ASC = Possibility of being married in past life, soulmate indication
SN-DSC = Soulmate linkage, strong relationship of many lifetimes
SN-MC = Possibility of an (important) social status in past life together
SN-IC = Family members, marriage partners
SN-NN = Family members from past life

Venus-Axis = Past life lovers, came back to pick up where they left
Saturn-Axis = Past life connection that was aborted prematurely, continuation of that bound in this life
Mars-Axis = Past life relationship with combative nature, meeting again to fix this
Jupiter-Axis = Husband-Wife / Father daughter / Teacher-Student

Understanding the Southnode

Planets conjunct your southnode can give of a strong sense of familiarity at first. But often as time progresses you notice that the idea you had of the other, turns out to be quite different. They are no longer the person you remember. There is usually challenge involved, the other influences whatever that planet stands for, so if someone’s Southnode is conjunct your Venus, they may strongly influence your finances, stability or love life in a less pleasurable way, especially if other hard aspect are involved from either your own chart or theirs. The positive potential is weakened with the Southnode.
The planet person may encounter disappointment in whatever that planet stands for, and the node person may unconsciously slip away or becomes confused and unsure, there’s some level of doubt involved.
The southnode person is a helping and guiding force in realizing that what you want and don’t want with respect to the meaning of the planet that’s touched. The contact with the Southnode often suggests a need to become more independent from the other.

With the Southnode we are inclined to fall back into old patterns, for example Juno conjunct southnode is a strong past life indication. If two people meet with such conjunction, they’re instinctively drawn to one another. There’s strong likelihood of seeing one another as spouse, but this is a past life memory. It has already been done and doesn’t necessarily belong to this life’s script and path. With this aspect it’s possible that the Southnode person becomes a jammer onto the Juno’s love and married life, often because of that strong magnetic pull, especially if other factors point to immense attraction, this contact can become deeply painful.

When a planet or angle touches the SouthNode of another person within synastry, the energy of that planet pulls you back into familiar territory, it’s something the both of you are well known with, it create a sense of something missing because the SouthNode lessens the focus of the planet that is touched.
When a planet or angle touches the NorthNode of another person within synastry, the energy of that planet pulls you forward into the lessons that you should learn. It amplifies the energy of the planet that is touched by the NorthNode, making it a prominent theme within the relationship.
Southnode usually points to the need to release something, whereas the Northnode suggests the need to cooperate, grow and evolve.

Aspects in the natal chart ; Planet-SouthNode :

This shows what traits your are well known with within yourself, what confidence you have brought into this life from the past. Behavior that naturally belongs to you, things you have learned in a past life. South Node-conjunctions cut off aspirations but stress the most natural powers an individual possesses.
• SouthNode : Natural abilities, gifts
• NorthNode : Challenge, purpose

Sun : Arrogant but naturally confident, strong will, unique
Moon : Moody but naturally in-tune with emotions, psychic, good instincts
Mercury : Chatty, superficial but naturally rational, curious and logic
Venus : Narcissistic and love-sick but naturally charming, great sense of beauty
Mars : Impatient but naturally active, energetic
Jupiter : Preaching but naturally ethical, wisdom, bringer of faith
Saturn : Serious and cold but naturally responsible, steady, realistic
Uranus : Eccentric but naturally original, social, intuitive wisdom/knowledge
Neptune : Dreamy and delusional but naturally compassionate, spiritual
Pluto : Secretive and manipulative but naturally researching, strong, warrior
Chiron : Bitter and anger towards the world but naturally wise, problem-solving

Past life in the Natal chart :

• SouthNode = pastlife karma
• Moon
• Saturn = karma in this life, the challenges
• The Angles / Axis = conjunctions are most important
• Many Retrograde planets = old soul, karmic leftovers that needs to be finished
• 29th degree = old soul, the last ‘exam’, karmic cycle to be finished in this life

A planet conjunct the ruler of your Southnode, indicates a past life issue. That planetary energy and theme is involved.

Moonsign = Past life ascendant
Ascendant = Past life sunsign
Sunsign = Future ascendant

Past life birthchart :

Change the birthtime (forward) until SN conjuncts the MC (exact)
You read this chart the same way as a birthchart.

• Ascendant : talents you’ve mastered in a past life and brought with you into this life
• Conjunction to ASC : qualities that are part of you
• ASC ruler houseplacement : Desires you’ve had at the end of past life
• Stellium in Sign/house : Theme of past life or important area of pastlife
• Planets in 10 : The things you achieved in a pastlife

Past life with a significant other

With this chart you can also check pastlife connections with other people.
Do a synastry of your pastlife chart and the natal chart of the person you’re interested in.
Any planets of the other person that are conjunct to your housecusps, will indicate a strong pastlife linkage between the both of you. The planet shows the nature of the pastlife connection.

Past life in another country :

Astrocartography may shine more light onto the specific feelings you have towards a certain place on earth. This is shown by the Northnode, Southnode and Moon.
More info click here .