Complete the Simstrology System

Download	What it does	Recommended
Simstrology Mod	Core system and main gameplay engine	Required
Simstrology Childhood	Extends Simstrology to younger Sims	Strongly recommended
Simstrology Skill	Adds study, research, and interpretation gameplay	Strongly recommended
Simstrology Aspirations	Adds long-term goals and storytelling paths	Recommended
Simstrology Degree	Adds University courses and a Simstrology Degree	Recommended
Simstrologist Career	Adds career paths for sims with level 3 skill or a University degree in Simstrology	Recommended

Not sure what to download? Start with Simstrology Mod, then add Childhood, Skill, and Aspirations for the complete experience.

PlumAntics Simstrology Mod (V2.6)

• A new Simstrology Hub brings the main Simstrology options into one place for human teen-and-older Sims. 
  • From the Hub, players can start or repair a chart, review chart and sky information, change save-wide settings, or open Cheats and Repairs. 

• The chart card includes house placements and current Sun progression. 
• Every Hub card has a clear "Return to main menu" option. 
• "Cheats and Repairs" now includes "Change a Sign", with separate Sun, Moon, and Rising sign pickers. 
• The older duplicate Sim pie-menu entries for these options, chart readouts, settings, and repair tools have been consolidated into the Hub. 
• Retrogrades now do more than apply moodlets: when the optional Retrogrades add-on is installed, active retrogrades can add small, action-based effects to ordinary play. 
  • Mercury can occasionally add a little extra wear after an eligible object is used. It never forces an object to break. 
  • Venus can make low-relationship social connections slightly less straightforward, while sincere relationship-repair interactions can receive a small boost. 
  • Mars can make an already-completed strenuous activity or repair more tiring. It never forces injuries, fires, or failed actions.
  • Jupiter rewards mentoring, tutoring, and rereading skill material, encouraging Sims to reconsider what they already know. 
  • Saturn gives a small completion reward after homework, bills, cleaning, and repairs.

PlumAntics Simstrology Mod (V2.51) 

Technical Fixes 

•  Normalized more Big 3 assignment flow in Python   
• Improved Moon and Rising runtime assignment handling   
• Fixed stale compatibility/chart-state cleanup paths   
• Improved follow-through when sign data changes and dependent systems need to resync   
• Continued AstroCore lifecycle/runtime integration for cleaner long-term maintenance   
• General under-the-hood stability and consistency improvements 
•  Supported by Zerbu's Custom Preferences Mod (you will need to redownload this as of July 11, 2026 for Sign Compatibility to work properly)

Simstrology Compatibility Update — Chemistry Gets Personal (v2.21)

This Simstrology update gives compatibility a deeper gameplay pass by connecting your Sims’ charts to existing The Sims 4 likes/dislikes and turn-on/turn-off systems.

Instead of compatibility living only as a hidden astrology calculation, Sims will now carry chart-based preferences that help shape how they respond to one another socially, emotionally, and romantically.

What’s New

Chart-Based Likes, Dislikes, and Turn-Ons

Simstrology now taps into existing TS4 preference systems to make astrological compatibility feel more active in gameplay.

Your Sim’s Big 3 will now influence preferences in three ways:

• Sun Sign adds one new Like and one new Dislike in Sim Characteristics
• Rising Sign adds one new Like and one new Dislike in Conversation / Communication preferences
• Moon Sign adds one new Turn-On and one new Turn-Off under Characteristics

These preferences are based on the Sim’s current chart and can be changed manually if you do not like the outcome. The stars may suggest the pattern, but you still control the story.

Like & Dislikes by sign (must have Growing Together installed)

Sun Sign	Like	Dislike
Aries	High Energy Sims	Ambitionless Sims
Taurus	Homebody Sims	High Energy Sims
Gemini	Cerebral Sims	Pessimistic Sims
Cancer	Optimistic Sims	Argumentative Sims
Leo	Spirited Sims	Pessimistic Sims
Virgo	Hard-Working Sims	Egotistical Sims
Libra	Optimistic Sims	Argumentative Sims
Scorpio	Cerebral Sims	Egotistical Sims
Sagittarius	High Energy Sims	Homebody Sims
Capricorn	Hard-Working Sims	Ambitionless Sims
Aquarius	Cerebral Sims	Egotistical Sims
Pisces	Emotional Sims	Argumentative Sims

Moon Sign	Like	Dislike
Aries	Arguments	Complaints
Taurus	Affection	Arguments
Gemini	Jokes	Deep Thoughts
Cancer	Affection	Malicious Interactions
Leo	Compliments	Complaints
Virgo	Discussing Interests	Silly Behavior
Libra	Affection	Arguments
Scorpio	Deep Thoughts	Small Talk
Sagittarius	Stories	Complaints
Capricorn	Discussing Interests	Potty Humor
Aquarius	Deep Thoughts	Affection
Pisces	Stories	Malicious Interactions

Rising Sign	Like	Dislike
Aries	Arguments	Small Talk
Taurus	Compliments	Arguments
Gemini	Gossip	Deep Thoughts
Cancer	Compliments	Malicious Interactions
Leo	Compliments	Complaints
Virgo	Discussing Interests	Silly Behavior
Libra	Compliments	Arguments
Scorpio	Deception	Small Talk
Sagittarius	Stories	Complaints
Capricorn	Discussing Interests	Potty Humor
Aquarius	Jokes	Compliments
Pisces	Stories	Arguments

Turn-ons & Turn-offs by Moon Sign (must have Lovestruck installed)

Moon Sign	Turn-on	Turn-off
Aries	High Energy	Homebody
Taurus	Homebody	High Energy
Gemini	Funny	Pessimistic
Cancer	Family-Motivated	Argumentative
Leo	Spirited	Messy
Virgo	Clean	Silly Behavior
Libra	Optimistic	Argumentative
Scorpio	Emotional Decision Makers	Egotistical
Sagittarius	High Energy	Pessimistic
Capricorn	Hardworking	Ambitionless
Aquarius	Cerebral	Egotistical
Pisces	Artsy	Argumentative

Pack Requirements

For the full compatibility preference system to show correctly, you will need:

• Growing Together for Sim Characteristics and Conversation / Communication likes/dislikes
• Lovestruck for Turn-Ons and Turn-Offs

If you do not own those packs, some preference-based features may not appear, but the core Simstrology chart system will continue to function. The compatibility feature is an add-on that can be deleted if needed.

Compatibility Warning: Sign Compatibility Add-on

The Sign Compatibility add-on changes the CAS Likes and Dislikes preference menu. This add-on may conflict with other mods that edit CAS preferences, Likes/Dislikes, or custom preference categories. If CAS will not open, gets stuck loading, or throws errors, remove this optional add-on first and test again. This add-on is optional. The main Simstrology mod does not require it.

Occasional Compatibility Moodlets

Sims may now receive occasional moodlets during various interactions, depending on how their signs and preferences line up.

This is meant to make compatibility feel more natural and less like a flat score. Sometimes Sims click. Sometimes they clash. Sometimes the chemistry is there, but the conversation still goes sideways.

How Sign Compatibility Works

This update uses element-based attraction as the foundation.

Signs naturally respond better to signs within their own element. Signs that fall into a disliked element may create more friction. If a sign does not appear as either a Like or Dislike, that pairing is treated as neutral.

Sign	Likes	Dislikes	Neutral
Aries (Fire)	Aries, Leo, Sagittarius	Cancer, Scorpio, Pisces	Taurus, Gemini, Virgo, Libra, Capricorn, Aquarius
Taurus (Earth)	Taurus, Virgo, Capricorn	Gemini, Libra, Aquarius	Aries, Cancer, Leo, Scorpio, Sagittarius, Pisces
Gemini (Air)	Gemini, Libra, Aquarius	Taurus, Virgo, Capricorn	Aries, Cancer, Leo, Scorpio, Sagittarius, Pisces
Cancer (Water)	Cancer, Scorpio, Pisces	Aries, Leo, Sagittarius	Taurus, Gemini, Virgo, Libra, Capricorn, Aquarius
Leo (Fire)	Aries, Leo, Sagittarius	Cancer, Scorpio, Pisces	Taurus, Gemini, Virgo, Libra, Capricorn, Aquarius
Virgo (Earth)	Taurus, Virgo, Capricorn	Gemini, Libra, Aquarius	Aries, Cancer, Leo, Scorpio, Sagittarius, Pisces
Libra (Air)	Gemini, Libra, Aquarius	Taurus, Virgo, Capricorn	Aries, Cancer, Leo, Scorpio, Sagittarius, Pisces
Scorpio (Water)	Cancer, Scorpio, Pisces	Aries, Leo, Sagittarius	Taurus, Gemini, Virgo, Libra, Capricorn, Aquarius
Sagittarius (Fire)	Aries, Leo, Sagittarius	Cancer, Scorpio, Pisces	Taurus, Gemini, Virgo, Libra, Capricorn, Aquarius
Capricorn (Earth)	Taurus, Virgo, Capricorn	Gemini, Libra, Aquarius	Aries, Cancer, Leo, Scorpio, Sagittarius, Pisces
Aquarius (Air)	Gemini, Libra, Aquarius	Taurus, Virgo, Capricorn	Aries, Cancer, Leo, Scorpio, Sagittarius, Pisces
Pisces (Water)	Cancer, Scorpio, Pisces	Aries, Leo, Sagittarius	Taurus, Gemini, Virgo, Libra, Capricorn, Aquarius

Compatibility by Chart Placement

This update also separates chemistry into three different layers:

Sun — Identity Compatibility

The Sun reflects a Sim’s core identity. These preferences influence who your Sim naturally relates to, respects, or clashes with on a personality level.

Rising — First Impressions and Social Engagement

The Rising sign affects how Sims socially enter the room, make first impressions, communicate, charm, provoke, or engage with others.

Moon — Emotional and Romantic Chemistry

The Moon now connects to attraction through Turn-Ons and Turn-Offs, shaping what feels emotionally compelling, comforting, or off-putting in romantic chemistry.

Simstrology Mod v2.2 update

Key updates:

• Retrograde moodlets will only appear as a reinforcement of a sim's current mood--example, if they are focused during a Saturn retrograde, they will get a small boost to that focused mood
• outer planets became a real optional gameplay layer, with support for Uranus, Neptune, Pluto, and Chiron transit data, chart readouts, icons, and house-linked effects when the Outer Planets add-on is installed
• natal chart and current-transit readouts became broader and cleaner, so add-on driven information can show up more consistently instead of feeling bolted on
•  house and transit state recovery was hardened, including better restoration of house transit buffs and better household refresh behavior after load or repair
• the shared Simstrological clock was tuned further, with broader Mars-plus sky setup support, refined transit timing behavior, and a fresh-sky reseed path for players who want to restart that layer in a save
• everyday onboarding became clearer through better gameplay tooltips, while the shared Friendly social interactions for transits, chart rulers, retrogrades, and natal chart reading were restored and cleaned up
• Big 3 follow-through got stronger for connected saves, including childhood auto-assignment support and a cleaner Core-side bridge for child-to-teen sign handoff recovery
• runtime performance and load stability were improved through additional efficiency guards, legacy cleanup, and better recovery behavior in the universal clock
• older migration-era leftovers were reduced, including removal of obsolete V2-only refresh or upgrade surfaces that no longer matched live gameplay
• compatibility behavior stayed better documented for players using moodlet-priority or emotion-overhaul mods, since those can still make retrograde or lunar moods feel stronger than intended

A living astrology gameplay system for The Sims 4.

About This Mod

PlumAntics Simstrology Mod is the core gameplay package for the Simstrology system. It gives Sims a Simstrological identity, tracks their chart state over time, and powers the shared world systems that the rest of the Simstrology line builds on.

This is the V2 release, and it is a major step forward.

Older versions leaned more heavily on XML-driven behavior. V2 moves the mod onto a Python-powered universal Simstrology clock, allowing the system to behave less like separate astrology features and more like one connected simulation.

In player terms: the stars are no longer just labels on a trait panel. They are part of a live gameplay engine.

What’s New in V2

V2 introduces a shared runtime that keeps chart-based gameplay moving as one system.

That means:

• one universal clock drives chart-aware gameplay
• retrogrades are tracked more consistently
• startup and save-load behavior are more reliable
• active systems can restore more cleanly when entering a save
• chart timing, state, and progression can work together instead of feeling disconnected
• add-ons like Childhood, Skill and the future Career can plug into the same live simulation layer

The result is a world that feels more dynamic, more coherent, and more alive.

Choose Your Onboarding Path

Players can enter V2 in one of three ways:

Sun First
A more step-by-step route that lets you build into the chart through Sun, Moon, and Rising over time.

Rising First
A more snapshot-driven route that uses Rising as the anchor and allows the broader chart to fill in from the current sky.

What the Core Mod Supports

Once a Sim is part of the system, the core mod can support:

• visible Sun, Moon, and Rising identity
• chart ruler assignment (interpretable at Simstrology Skill Level 4)
• dominant chart element and mode markers
• natal chart readouts (available to read at Simstrology Skill Level 4)
• house systems (available to read at Simstrology Skill Level 4)
• progressed Sun systems
• retrogrades (retrograde notices begin at Simstrology Skill Level 2, with deeper transit awareness opening at Level 4)
• return-style events such as Moon Return and Solar Return
• compatibility-style sign discovery and social flavor

The goal is for a Sim’s chart to feel like an ongoing part of their life, not just a one-time trait assignment.

Why the Universal Clock Matters

The universal Simstrology clock is what makes V2 feel like a living system.

Instead of every feature acting on its own, the mod can now:

• remember hidden chart state
• restore active systems on load
• keep retrograde timing coherent
• drive notices, buffs, and chart refresh behavior from one live source

This becomes even more important as the Simstrology ecosystem expands. The core mod is the shared astrological world that later systems live inside.

Skill Integration

On its own, the core mod gives Sims their chart identity and shared world systems.

When PlumAntics Simstrology Skill is installed, that identity becomes something Sims can actively study and interpret. Sims with enough Simstrology Skill can begin reading chart information rather than simply carrying hidden chart state behind the scenes.

The current progression looks like this:

• the core mod gives the Sim a chart
• the Skill add-on allows that chart to be studied and understood
• higher knowledge unlocks richer interpretation gameplay

In the merged design, Level 4 Simstrology is the main interpretation tier where fuller chart reading begins to open up.

What Makes Simstrology Different

This is not just a set of astrology-flavored traits.

What makes the Simstrology Mod distinctive is:

• two different onboarding fantasies: Sun First and Rising First
• a shared chart-state model behind the scenes
• a live universal Simstrology clock in V2
• merged systems for retrogrades, houses, returns, and chart markers
• strong expansion support through Skill now, with Career and other add-ons later

The fantasy is simple: Sims do not just have signs. They live inside a moving Simstrological world.

Best Fit For Players

This package is for players who want:

• a core Simstrology framework for the whole save
• charts that matter beyond initial assignment
• dynamic systems like retrogrades and chart-based notices
• a foundation that grows naturally with the Skill, Childhood, and later Career add-ons

If this is the only package installed, it should still feel like a full core identity system. If you install add-ons, it becomes the foundation everything else builds on.