Umbriel University: the free lessons

A real, sequenced astrology course. These 50 lessons are free to read here in full — the astronomy under the astrology, how a birth chart is actually calculated, and how to read one. No account, no email.

50 free lessons · about 49,000 words · every one also runs on your own chart inside Umbriel

Also in: Deutsch · Español · Français · Italiano · Português · Русский · Türkçe · العربية · 中文

Astronomy for Astrologers

The sky itself: the ecliptic, the tilt, the clocks and where the numbers come from. Open in any order — Module 1 never waits for it.

1. The line everything is measured alongAfter this lesson you can say what the ecliptic is, why nearly every planet keeps close to it, and why your chart gives each planet one number instead of three.
2. The tilt, the seasons, and why 0° Aries is a momentDerive the four cardinal points of the zodiac from the Earth's axial tilt, and explain what that same tilt sets a hard ceiling on.
3. Precession: why the signs left the constellationsExplain the wobble that moved the equinox, put a number on the drift, and answer the most common objection to astrology accurately rather than defensively.
4. Two clocks, and why the Ascendant moves a degree every four minutesDistinguish the solar day from the sidereal day, and use the resulting rate to say honestly how much of a chart an uncertain birth time actually puts in doubt.
5. Orbits and speeds: where the timescales come fromRead a planet's orbital period as the length of the chapter it writes, and tell a sidereal period from a synodic one.
6. The Moon's orbit: phases, nodes and eclipsesDerive the lunar phases as an aspect, explain why the nodes move backwards, and say exactly what an eclipse needs that an ordinary New Moon does not.
7. Where a planet actually is: three frames and one originTell the ecliptic, equatorial and horizon frames apart, and say which astrological claims live in which — including the one your houses are built in.
8. Where the numbers come fromSay what an ephemeris is, what a modern one actually contains, and name the four things that make a beautifully precise chart wrong.
9. Time is the hard partWalk a birth time from a hospital clock to the timescale the planets are computed in, and name the three questions to ask of any recorded time.
10. What you could actually have seenRead the Sun's glare as a measurable zone, tell a morning star from an evening star off the chart, and explain why half the traditional condition rules are visibility claims.

Casting a Chart

From a birth certificate to a wheel, by hand and by engine — and what a house system actually does.

1. From a birth certificate to a wheelName the five steps between three pieces of birth data and a finished chart, and say which input controls which part of the result.
2. The Ascendant and Midheaven, builtSay what each angle is a crossing of, explain why they are not 90° apart, and use signs of long and short ascension to predict which Rising signs are common.
3. What a house system actually doesSay what each family of house systems divides and by what, and explain what does and does not change when you switch between them.
4. Why house systems disagree, and where they breakPredict how much two house systems will differ for a given chart, name the latitudes where some systems fail outright, and choose one for a reason you can state.
5. Casting a chart by hand, onceInterpolate a planet's position from a daily ephemeris and assemble a chart without software, then check your work against the engine.
6. How to tell a chart is wrongRun four checks that catch most bad charts in ten seconds, and recognise the one common error that no check can catch.

The Cosmic Map

Signs, elements, planets & glyphs: the alphabet.

1. What a birth chart isAfter this lesson you can say what a birth chart is a picture of, why your date, time and place each change it, and what kind of claim astrology is making.
2. The twelve signsAfter this lesson you can name the twelve signs in order, say where the ring starts and why, and read a sign as the style a planet works in, not a label for a person.
3. Elements & modalitiesAfter this lesson you can rebuild all twelve signs from four elements and three modalities, and say what it means when your own chart has a lot of one element, or none.
4. The planets & their glyphsAfter this lesson you can recognise every planet's glyph (the small symbol that stands for it on the wheel) and say why each planet means what it means, without memorising a list of keywords.
5. Retrograde planets (℞)Explain why retrograde motion happens at all, read ℞ in a chart, and tell a natal retrograde apart from the transit everyone complains about.

The Framework

Houses and the angles, where life happens.

1. The twelve housesAfter this lesson you can say what a house is, where the twelve come from in the sky, and read an empty house without inventing anything.
2. The angles: Ascendant, MC, and why time mattersDefine all four angles, read them as two axes rather than four points, and judge how much of a chart survives an uncertain birth time.
3. Rulership & the chart rulerFind your chart ruler, follow a rulership from one house to another, and read a house that has no planet in it.

The Conversations

Aspects: how the planets talk to each other.

1. Aspects: how planets talkAfter this lesson you can name the five major aspects, say what each one does, and pick out the strongest ones in your own chart.
2. Aspect patterns & the bigger pictureRecognise a stellium, T-square and grand trine, and read repeated themes.
3. Chart shapes & emphasisRead the overall shape of a chart and spot where the emphasis falls.

Reading a Chart

Method & synthesis: putting it all together.

1. The lunar nodes: your growth axisExplain the South and North Nodes as a past-comfort / growth-direction axis.
2. Your Big Three: Sun, Moon, RisingAfter this lesson you can find your Sun, Moon and Rising, say which question each one answers, and notice when they pull in different directions.
3. A method for reading any chartApply a repeatable step-by-step method to approach an unfamiliar chart.
4. A full worked reading, step by stepWatch the five-step method applied to a whole chart, from blank wheel to a few clear themes.
5. Practise, practise, practiseCommit to reading real charts, and know how to use the Practice drills.

Read Along with Umbriel

An astrologer breaks down one real chart, Umbriel's own, layer by layer. You do each step on yours. Then two charts together.

1. Meet the chart: cast it, then check the timeCast a birth chart correctly, and know how much to trust the birth time behind it.
2. The Big Three, read on a real chartRead a Sun, Moon and Rising together as one person, using sign, house and condition.
3. The chart ruler, and where every road endsFind a chart's ruler, follow its dispositor chains, and read which houses run the others.
4. Balance: elements, modes and the draconic flipRead a chart's elements, modes, signature and singletons, and know what a draconic chart adds.
5. Houses: where it all happensPlace each planet in its house, read empty houses through their rulers, and know when the house system matters.
6. Planets on the angles, and how high the Sun wasFind the planets that sit on a chart's four angles, and read the sky's real horizon at birth.
7. Aspects: tightest first, and what to skipSort a chart's aspects by orb, skip the generational and derived ones, and read the few that are personal.
8. A planet's condition: how well it can actCheck any planet for a station, the Sun's glare, out of bounds and phase, decide whether the chart is a day or night chart, and say what each one changes.
9. Lilith, Eros and desireFind the Liliths, Eros, Juno, Venus and Mars in a chart, read where desire plays and what refuses to be tamed, and tell a loud contact from a faint one.
10. Fixed stars and degree imagesCheck fixed stars by tight conjunction, read only the ones that carry a meaning, and use degree images as pictures that can confirm a theme.
11. When other systems agree: count your sourcesRead Vedic, Human Design, BaZi and numbers beside the natal chart, and count how many truly independent sources stand behind a theme.
12. Timing: the chapter now and the windows aheadName the current chapter from the time-lords, lay out the next twelve months as dated windows, and spot when several techniques are one measurement counted twice.
13. Persona charts: each planet as its own personExplain what a persona chart is, read one as a character, and check whether its points land back on the natal chart.
14. Putting it together: Umbriel in one paragraphCollapse a whole chart into two or three repeated themes, give the contradiction its own sentence, and say a finished reading out loud that ends on a question.
15. Synastry step by step: angles, contacts, housesLay your chart beside someone else's and read the contacts in an astrologer's order: angles first, tightest contacts next, every line both ways, then the house overlays.
16. The composite chart: the midpoint “us”Read a composite chart like a birth chart while knowing what it inherits from its two parents, which aspects to skip, and why it has no birthday.
17. The Davison: the relationship as a real momentRead a Davison chart as the bond's own birth chart: what it inherits, its shape and handle, its daily work, its heat, who completes it, and how gently to hold its clock.
18. Reading the pair: themes, a calendar, out loudCollapse synastry, composite and Davison into three themes, find the shared calendar, and say the bond out loud in one paragraph that ends on a question.

What is behind Membership

These are the free lessons and they are complete: nothing has been cut out of them. The course continues past them with 67 further lessons — timing and prediction, dignity and sect, relationship work, the traditional toolkit, the schools of thought, and the professional track — and those are part of Umbriel Membership. What Membership buys is the writing and the advanced material; anything the engine works out stays free, which is why every chart, every calculation and every lesson above costs nothing.

Elsewhere on Umbriel

“University” is Umbriel’s name for a real, sequenced course, not an accredited academic institution. Anything you earn here is Umbriel’s own record of course completion, recognised by us, not a licence, a diploma or a government-accredited qualification. Astrology is offered for reflection and enjoyment, not as a regulated profession.