Map, not verdict
Chart Foundations
A birth chart is a symbolic diagram of the sky for a time and place, and it becomes superstition the moment it is treated as a finished fate.
What a birth chart is
A birth chart, or nativity, is a diagram of ecliptic longitudes for the Sun, Moon, and planets at a given moment, arranged around the horizon of a given place. In this guide the circle is the tropical zodiac. The figure is a teaching map drawn by calculation and then interpreted by a tradition.
It is not a photograph of character, and it is not astronomy's opinion about your future. Astronomers and astrologers can share a position and part company completely on the sentence that follows it.
Modern tropical astrology is a symbolic language, not astronomy and not destiny. The positions can be calculated with high precision by people using proper tools. The meanings layered on those positions come from tradition, argument, and use.
This site explains the language. It does not calculate charts, does not store a birth time, and will not hand you degrees. If a page elsewhere invents a degree for you without asking for data and showing its work, close it.
Date, time, and place
A standard natal chart needs three things: the date, the time, and the place of birth. The date locates the slower story of which signs the planets occupy, though the Moon moves fast enough that the time matters for her degree too. The place supplies latitude and longitude so a local horizon and meridian can be computed.
The time ties that horizon to the rotating sky. Leave any one of these out and you have a partial diagram, which can still be useful if you label it partial.
Earth turns through about fifteen degrees of sky in an hour, and a tropical sign spans thirty degrees, so the sign on the eastern horizon changes on the order of every two hours. The exact pace depends on latitude and on which sign is rising, because signs rise at different speeds. An error of many minutes can shift cusps in quadrant systems. An error of hours can change the rising sign and every house counted from it.
Clock changes, hospital rounding, and forgotten time zones are common. If the clock was wrong, say so. Do not sand the uncertainty off in order to feel special.
The rising sign
The rising sign, or ascendant, is the tropical sign intersecting the eastern horizon at that time and place. Symbolically it is a threshold: how a life steps into a room, the chart's helm in traditional language, a style of beginning. It is not a mask you must perform, and it is not more real than the Sun, the Moon, or the rest of the chart.
People often meet it as manner rather than as biography. Manner can change without the horizon being offended.
Without a reliable time you do not have a reliable rising sign. Guessing one from a face, a vibe, or a photograph is a parlor trick, not a method, and it slides quickly into physiognomy, which this library refuses. You can still study planets in signs, and aspects between them, as a partial reading.
Write the word partial in the margin and enjoy the honesty. Many useful conversations about a life never need a degree at all.
Houses and their systems
Houses are twelve symbolic fields counted from the ascendant. Whole-sign houses give the entire rising sign to the first house and each next sign to the next house, so every house is an even thirty degrees of zodiac. Placidus, a common quadrant system, divides the sky by a time-based proportion between horizon and meridian, which makes houses unequal and can place the midheaven outside the tenth house.
A planet early in the rising sign can therefore be first-house in one system and twelfth-house in the other. The first-house page holds the same comparison, because that is where beginners meet it.
Other systems exist, including equal houses, Koch, Regiomontanus, and Campanus. They are methods with histories, not discoveries of twelve rooms in the atmosphere. House systems differ, and a planet can change house when the method changes even though its zodiacal sign does not.
You were not born belonging to a system. A reader chooses one and should name it. Know which system your chart used before you speak with confidence about a house, and do not mix meanings from two systems in one breathless paragraph.
Aspects on the wheel
Aspects are angular relationships between positions on the ecliptic. The ones this library teaches in full are the conjunction at zero degrees, the sextile at sixty, the square at ninety, the trine at one hundred twenty, the quincunx at one hundred fifty, and the opposition at one hundred eighty. A calculator decides which pairs count by applying an orb, a permitted slop around the exact angle.
The aspect pages explain the pictures. They are not additional laws.
Orbs are conventions, not laws. Two serious traditions can disagree about a wide conjunction and both be following a rule. Older authors often assigned orbs by planet rather than by aspect. Read the tightest aspects first.
Do not add minor aspects from memory in order to make the chart more dramatic, and do not ignore a tight square because a trine is more flattering. Geometry is the calculable part. The story you tell about it is the craft, and the craft should stay revisable.
On paper, without this site
Draw or print a blank circle and divide it into twelve signs if you want a beginner's sheet. From a reputable astronomical ephemeris, or from an established chart calculator used elsewhere that documents its ephemeris, its time-zone handling, and its house system, copy the positions you were given. Do not compute longitudes in your head, and do not count them on your fingers from a birthday meme. Mental math will not yield a nativity.
Mental math will yield confidence without a method. Write each planet's sign. If and only if a birth time exists, copy the rising sign and the house system named on the printout.
List only the aspects the source already lists. Beside each planet, write one plain question from this guide, in pencil. Pencil is the right technology: you are allowed to change your mind when you know more, or when the interpretation insults the facts of your life.
This site does not calculate charts and does not know the degree on anyone's midheaven. If you want numbers, go to a tool built for numbers, then come back here for language. Leave with a plan a symbol cannot perform for you.
At a glance
| Date | Locates planets in the tropical signs for that day; the Moon may still need the time |
| Time | Sets the rising sign and the houses; errors move them |
| Place | Sets the local horizon and meridian |
| House system | Decides boundaries; the signs of the planets stay put when the method changes |
| This site | Teaches symbols and does not calculate charts or invent degrees |
Pencil wheel
- 1If you lack a chart from a proper source, stop and get one elsewhere, or work only with themes and skip the houses.
- 2Copy the positions in pencil and label the house system and the time-zone assumption in the corner.
- 3Circle three symbols only: one that steadies you, one that irritates you, and one you do not yet understand.
- 4Under the wheel, write a single action you will take this week that no diagram can take for you.
Questions
- Which piece of data am I treating as exact when it was only remembered?
- Am I using a house meaning from a different system than the one printed on my page?
- What remains true about my life if I never resolve the uncertain degree?