Mars Square Jupiter Synastry: When What Drives One of You and What Widens the Other's World Start from Different Places

Every birth chart has a Mars and a Jupiter, and they do different jobs. Mars is what drives you: your energy, your effort, your initiative, what you go after and how you go after it. Jupiter is what widens your world: your encouragement, optimism and generosity, and the sense that there is more to try and room to try it. In this contact, one person's Mars is about 90° from the other person's Jupiter, a quarter of the way round the zodiac.

A square usually joins two signs of the same mode (both cardinal, both fixed or both mutable) that belong to different elements. (Usually, not always: near the edge of a sign, the pattern can shift.) That is the geometry. The idea that this reads as a difference of speed is an editorial reading of this pair, not something the angle shows; the angle shows only that the elements differ.

This pairing can appear between friends, siblings, colleagues, flatmates, or a parent and their child as readily as between partners, and it is one contact among many in any two charts.

In this contact one of you brings Mars and the other brings Jupiter. Call them the Mars person and the Jupiter person.

The contact does not say which of you is which in daily life, and either of you may recognise both sides in yourself. If the link also runs the other way, from the Jupiter person's Mars to the Mars person's Jupiter, each of you is both.

One thing this contact can give is energy. As the wider idea and the working effort start from different places, the difference itself can be what gets something moving, and either of you may be the one who says "let us try".

Either of you may also find it easier to say what size a project feels right once you have heard the other's view.

What each of you may want is a say in how much is enough. It can matter to be asked which parts are for now and which are for later.

These are sketches, not reports: illustrations of how the contact might look across different kinds of pairs.

• Flatmates. Two flatmates paint flowerpots for the stairwell. The list of plants has grown to two pages, and the paint is still on the first pot.
• Friends. Two friends press flowers from a long walk. The press holds a dozen sheets, and the picture frames they have in mind come to thirty.
• Parent and child. A parent and their child fill a birdbath in the yard. The talk has moved from one birdbath to a whole corner for visitors.
• Colleagues. Two colleagues start a kombucha jar in the kitchen. There is already a rota for next month and only one jar.

Each sketch is a pause partway through a plan.

The older sources used here have no stored passage that bears on a Mars and a Jupiter in any aspect. One of them, Vivian Robson's *A Students' Text-Book of Astrology* (1922), has a list on p. 141 that names the pair, not an aspect. That line is not among the passages checked for this page, and nothing from it is used.

Nothing in the older sources used here tells a square from an opposition. The distinction this page makes, that a square reads as a difference of speed, rests on the kinds of sign a square usually joins: signs of different elements. It is an editorial reading, not something the older books say about Mars and Jupiter. Everything else on this page is editorial as well: who the Mars person and the Jupiter person are, what each gives and may want, and the sketches, which are illustrations.

• A plan may be larger by the close of a conversation than at the start.
• You may each try something you would not have tried alone.
• A list can be longer than the week has room for.
• A bigger version of an idea may arrive before the first one is under way.