The same degree, and a very narrow window
A conjunction is two bodies at the same ecliptic longitude, with an eight degree orb. The Moon travels about thirteen degrees a day, faster than anything else in the chart, so it crosses that whole eight degree approach in well under a day and clears the other side just as quickly.
That gives a window of roughly a day and a bit in every lunar month of about twenty seven and a third days, since the Moon passes Saturn once each circuit. In frequency terms the aspect is not unusual, but in timing terms it is sharp. The Moon can be conjunct Saturn at breakfast and out of orb by the following morning, which is why an accurate birth time matters more for this aspect than for almost any other Saturn contact.
Saturn contributes almost nothing to the motion. It takes about twenty nine and a half years for a full lap and covers only around twelve degrees a year, so for this purpose it is a fixed marker the Moon runs past.
The reflex and the rule in one place
The Moon in the tradition is instinct, habit, appetite and the part of a person that reacts before deciding. Saturn is limit, duration, caution and the standard that has to be met. A conjunction fuses them rather than setting them against each other, so the restraint is not experienced as an interruption. It is simply how the reaction arrives.
The recurring description is guarded feeling and early self-reliance: a person who learned young that comfort was conditional, who does not ask for much, and whose emotional responses are unusually consistent because they are being checked before they surface. Older sources write this up in flatly gloomy terms. Contemporary practitioners tend to describe the same configuration as emotional durability, and point out that the aspect appears constantly in charts of people who look after others.
Both accounts agree on one point, which is that nothing here is casual. Whatever the Moon would otherwise do quickly, this conjunction slows down and gives a shape to.
Sign, house and the size of the orb
Sign changes the reading substantially, and the traditional dignities do a lot of work. In Cancer the Moon is at home and Saturn is not, so the conjunction reads as a strong instinct under an uncomfortable restriction. In Capricorn the balance is reversed and the same aspect is usually described as far more settled, since Saturn is in its own sign and the Moon is not fighting for territory.
House placement names the area. The fourth is the version written about most, because it doubles the domestic theme and is the placement most often connected to a parent. The tenth reads as a public and working version, and the seventh puts the same pattern into partnership.
Orb decides how much to believe. Inside two degrees the description is usually recognisable to the person concerned without any prompting. At six or seven degrees it is a background note that a closer aspect from Venus or Jupiter can override entirely. Because the Moon covers thirteen degrees a day, a birth time out by a few hours can move the orb by several degrees.
What else to look at before deciding
Check whether the conjunction is applying or separating. A Moon closing on Saturn is traditionally read as the sharper version, and a Moon already past it as the milder one. Practitioners disagree about how much weight this deserves, but it is easy to determine and worth knowing.
Check the phase as well. The Moon's relationship to the Sun at birth is a separate matter from this conjunction, and a Moon conjunct Saturn near a new moon reads differently from the same aspect at a full moon, when the Sun is opposite both.
Finally, look at whether anything else touches the pair. A trine to the conjunction from Venus or Jupiter is generally read as loosening it noticeably, while a square from Mars is read as adding pressure rather than relief.
The check above gives you the exact orb along with the sign and house, and with a fast body like the Moon that figure is the whole difference between an aspect you have and one you nearly have.
Questions people ask about this
Why does birth time matter so much for this aspect?
Because the Moon moves about thirteen degrees a day, faster than any other body in the chart. A birth time out by a few hours can shift the orb by several degrees, and a time out by half a day can move the aspect in or out of range entirely.
How often is the Moon conjunct Saturn?
Once in each lunar circuit of roughly twenty seven and a third days, since the Moon laps the zodiac and passes Saturn every time. The eight degree orb means each pass lasts a little over a day.
Is Moon conjunct Saturn a difficult placement?
Conjunctions are classed as neither easy nor hard. This one is usually described as feeling that arrives already restrained, which older sources treat as bleak and modern ones treat as durable. Sign, house, orb and the rest of the chart decide which reading fits.
Does the sign change the reading much?
Yes, more than for most aspects, because both bodies have clear traditional dignities. The Moon is strong in Cancer and Saturn is not, while the reverse holds in Capricorn, so the same conjunction in those two signs produces quite different descriptions.
What does an applying conjunction mean here?
It means the Moon had not yet reached Saturn's degree at the moment of birth and was still closing on it. Tradition reads applying aspects as more forceful than separating ones, though practitioners vary in how much weight they give this.
Can anything soften the aspect?
A close trine or sextile to the conjunction from Venus or Jupiter is generally read as easing it, and a well placed Moon by sign does the same. A square from Mars or a further hard contact to either body tends to make the pattern more prominent instead.