The angle, and why the orb is narrow
A sextile is sixty degrees, a sixth of the circle, and it is allowed only five degrees of orb. That is deliberate. The convention assigns the weakest of the major aspects the smallest working window, so a Moon and Mars fifty six degrees apart qualify and a pair sixty seven degrees apart do not.
Sextiles connect elements the tradition regards as cooperative, fire with air and earth with water. A Moon in Capricorn sextiles a Mars in Pisces or Scorpio. The elements are not identical, as they are in a trine, so the two bodies get along without being interchangeable, and that partial match is why the aspect is described as conditional rather than automatic.
In each lunar cycle the Moon makes four sextiles to Mars, two on each side of the conjunction and opposition. The configuration is common in the sky and common in charts.
Courage on request
The Moon is habit and need, the layer that responds before you decide. Mars is the faculty of pushing, defending and finishing. A sextile keeps them on good terms without joining them, so the drive is reachable but does not force itself on the instinctive layer.
The descriptions that follow are about capacity. Someone who can act when they choose to, who can raise their voice without it costing them, who recovers physical energy readily. What the aspect does not describe is compulsion. There is nothing here that makes a person act, which is the whole distinction between a sextile and the harder contacts.
The practical consequence is that this aspect is frequently invisible in a chart reading until it is pointed out, and frequently confirmed once it is. People recognise the description of an ability they have not been in the habit of naming.
Sign, house and the state of Mars
Element pairing sets the flavour. Earth with water gives endurance and a practical kind of nerve, applied to work and to physical circumstances. Fire with air gives quickness, argument and social confidence. The same sixty degrees produces two quite different accounts depending on which pairing is involved.
Houses keep the aspect local. Because a sextile spans only two signs, the two houses are usually adjacent or near it, so the effect tends to stay in one region of the chart rather than tying distant parts together. A Moon in the second sextiling a Mars in the fourth reads as energy applied at home and to what you own. A Moon in the ninth sextiling a Mars in the eleventh reads as initiative among groups and around study.
Mars itself still governs the far end. A dignified Mars supplies more through the sextile than a Mars in fall does, and a Mars near a station is given added weight because it is barely moving.
Orb, birth time and the check above
The five degree limit means there is no such thing as a usefully wide sextile. Inside two degrees the aspect is worth a paragraph. At four and a half it sits at the edge of the convention and many astrologers would set it aside in favour of something stronger elsewhere in the chart.
That narrowness makes an accurate birth time important. The Moon moves about half a degree an hour, so a time recorded to the nearest hour carries enough uncertainty to move an aspect in or out of a five degree window. If your time is a rounded estimate, treat a borderline sextile as unresolved.
Mars retrograde, which occurs for roughly two months in every twenty six, is read as force turned inward, so the sextile is described as available privately rather than displayed. The widget above gives you the exact separation, both signs, both houses and the condition of Mars at your birth.
Questions people ask about this
What does Moon sextile Mars mean?
It means the Moon and Mars were sixty degrees apart at birth, within a five degree orb. The tradition reads it as assertive energy that is easy to reach when wanted, without the compulsion of a hard aspect.
Why do sextiles get a smaller orb than trines?
Because convention treats them as the weaker aspect. The general rule is that the more forceful an aspect is considered, the further from exactness it is allowed to operate, and the sextile sits at the bottom of that list.
Is this aspect worth reading at all?
In a tight orb, yes. It describes an available capacity, and the tradition considers that meaningful even though it is not dramatic. At the edge of the orb it is usually outweighed by stronger contacts.
How does it compare to Moon trine Mars?
The trine shares an element, gets seven degrees of orb, and is read as operating by default. The sextile joins compatible but different elements in a narrower window, and is read as needing to be taken up.
Does an uncertain birth time matter here?
More than for most aspects. With only five degrees of orb and a Moon moving half a degree an hour, a few hours of uncertainty can decide whether the aspect is in the chart at all.
What if Mars was retrograde at birth?
Mars is retrograde for about two months in every twenty six. The conventional reading is force applied inwardly rather than outwardly, which makes the sextile quieter in description without removing it.