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    2,054,849 files checkedFiles from Modrinth and CurseForge we downloaded and checked. Counted on 25 Oct 2026.636,163 files with their code readFiles whose code we turned back into readable code and read, in an isolated environment. Counted on 25 Oct 2026.269,417 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
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    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    Caelum

    Mod

    A more realistic sky with stars, planets, and eclipses.

    B84/ 100
    • OverviewB
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 1.21.1
    • ModpacksIn 209
    • ReleasesLatest 23 Oct

    Download

    caelum-3.0.0.7+1.21.1.jar

    Released 23 Oct 2026 · 372.5 KB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade B

    How grades work

    Strengths

    • Security checks passed
    • Public source code and issue tracker
    • Widely used
    • Around for years

    Points lost

    • Releases replaced within 3 days to fix a problem−6 points
    • Releases in only 3 of the last 24 months−4 points
    • Some modpacks removed it−1 point
    All 11 criteria

    • Maintenance

      4 points lost23 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.2 days ago (23 Oct 2026) 12 / 12
      Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.1.21.1 on NeoForge, 1.20.1 on Forge. 65% of the 995 popular NeoForge mods updated in the last 6 months also have files for 1.21.1. Latest Minecraft: 26.3. 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 3 of the last 24 months 2 / 6

    • Stability

      7 points lost15 / 22
      Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.23 of the 170 modpacks with two or more versions removed it in a later one (14%) See the 23 modpacks9 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.3 of its 8 releases in 2 years needed a quick fix (38%) See the 3 releases1 / 7
      Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.None 5 / 5

    • Transparency

      Full points10 / 10
      Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · Nuparu00/Caelum 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · Nuparu00/Caelum 3 / 3

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.2,992,444 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.4.9 years, 11 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in both latest files for recent Minecraft versions. See Security
    Total84 / 100

    59.5 of the 71 points that apply = 84 out of 100. The points above are rounded to whole numbers.

    Images

    • The 12/08/2026 partial solar eclipse (later)
    • 1/1/2000 10 AM Equator
    • 1/1/2000 10 AM South Pole
    • 1/1/2000 10 AM North Pole
    • Winter Night Sky
    • Orion from the equator
    • Ursa Minor from the northern winter sky
    • Orion from the northern winter sky
    • Crux from the southern summer sky
    • Morning Mercury and Venus
    • Morning Venus through Spyglass
    • Jupiter through Spyglass
    • Saturn through Spyglass
    • Mars through Spyglass
    • Realistic sun size ON
    • The 12/08/2026 partial solar eclipse
    • The 28/08/2026 lunar eclipse
    • The 2117 Venus transit
    • The inner solar system
    • The outer solar system

    About

    Caelum makes Minecraft’s sky more astronomically realistic by calculating the positions of the Sun, Moon, planets, and other celestial bodies from orbital elements and in-game time. Custom stars can replace or supplement vanilla stars, with options to hide stars or adjust their color, brightness, and size; resource packs can also add or edit the star data. As time passes, the visible constellations change through the year, while the Moon moves independently of the Sun and displays lunar phases. The sky can respond to a player’s position along the Z axis: stars, the Sun, and the Moon shift with latitude, bringing lower solar paths and polar day or night effects near the poles. The mod can produce solar and lunar eclipses and planetary transits, with planet positions corresponding approximately to real-world dates; configurable celestial objects and orbital data allow moons and planets to be added or edited. Time progression, day length, orbital periods, axial tilt, eclipse behavior, and the apparent size of the Sun can be configured, and optional server support lets the Sun’s height affect light levels and mechanics such as mob spawning and daylight sensors.

    Written from Modrinth , CurseForge and the GitHub README . How we write it

    In-game changes

    Changes the game's code in 5 areas: Mobs and their behaviorChanges 6 game code files in this area: mobs, animals, villagers, projectiles and how they move and act., Server and world logicChanges 3 game code files in this area: the world, commands, scoreboards, saved data and game rules., World renderingChanges 2 game code files in this area: drawing the terrain, sky, clouds and weather., World generationChanges 1 game code file in this area: terrain, biomes and structures made when new land is created. and Blocks and fluidsChanges 1 game code file in this area: how blocks, fluids and redstone work..

    Adds no new blocks, items or other content.

    Keeps all of vanilla Minecraft's textures, models and sounds.

    Often used with it

    See all 29
    Sodium Dynamic LightsCChat HeadsAAstikorCarts ReduxAAmendmentsAAI Improvements: Performance TuningA

    Details

    Creator
    Sophka
    License
    MIT License
    Downloads
    3M
    Created
    12 Dec 2021
    Official pages
    Modrinth , CurseForge
    Links
    Source code , Issues , Wiki , Discord

    Security

    No harmful code found

    We checked its files and read their code, without running it.

    What it can do on your computer

    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them. 1 file in your config folder.

    Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.

    How we checked · All 4 latest files checked, last on 23 Oct 2026
    • FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.
      4 latest files: the newest file for each Minecraft version and loader. The answer above is about the 2 for recent versions. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
    • Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.
      Read without running it
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares that the project reads or edits things on your system outside the game. Since 13 Aug 2026, Modrinth's rules require it when this applies.
      Nothing declared about your system outside the game.
    • Looked for, not foundWe looked for these in the file and did not find them.
      The internet, folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends

    We read its code without running it: it contacts no web address while you play.

    Why we show this: a mod can send things about you over the internet, like your player name or your login. Contacting an address to check for updates or download files sends nothing about you. Not in the grade: sending data can be normal for what a mod does.

    How we checked · Both files read
    • Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.
      The code of both files, for recent Minecraft versions. See each file in Releases
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares crash reports, usage data and advertisements. Since 13 Aug 2026, Modrinth's rules require it when a project collects data on its users or shows advertisements.
      Nothing declared about crash reports, usage data or advertisements.

    AI

    No sign that AI was used to make it

    We looked for AI tools in its texts, files, images and code history and found none.

    No sign of AI in the game

    We found no AI service, AI library or AI model file in its code.

    Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.

    How we checked · 6 places read
    • Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.
      No AI content or AI features declared.
    • Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.
      Nothing found
    • Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.
      Nothing found
      16 of 22 changelogs read
    • Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.
      Nothing found
    • Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.
      Nothing found
      47 images read
    • Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.
      No AI service, AI library or AI model file
      46 code files read

    Compatibility

    See all 11 files
    NeoForge
    Forge
    1.181.201.2126.1

    Point at or tap a version to see its loaders.

    Runs onWhere to install it: in your game, on the server, or both. As the author says on Modrinth.Works in your game alone. If the server has it too, you get extra features.
    RequiresProjects you must also install for it to work. From the author's lists for its files for recent Minecraft versions, or from its project page.Nothing
    OptionalProjects it can work with but does not need. The author lists them.Nothing
    IncludesProjects packed inside its files.Nothing
    Speed of updatesHow fast it gets a file for new Minecraft versions, on average, compared with similar projects. Not part of the grade.It has no file for Minecraft versions newer than 1.21.1. Many recently updated mods still support 1.21.1.

    Related projects

    Projects that need Caelum to work.

    ProjectTypeDownloadsGrade
    TFC CaelumEMod287K downloads

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    30150
    Oct 2024: 18 modpacksNov 2024: 12 modpacksDec 2024: 23 modpacksJan 2025: 21 modpacksFeb 2025: 22 modpacksMar 2025: 13 modpacksApr 2025: 16 modpacksMay 2025: 15 modpacksJun 2025: 14 modpacksJul 2025: 14 modpacksAug 2025: 20 modpacksSep 2025: 21 modpacksOct 2025: 14 modpacksNov 2025: 16 modpacksDec 2025: 11 modpacksJan 2026: 16 modpacksFeb 2026: 18 modpacksMar 2026: 16 modpacksApr 2026: 13 modpacksMay 2026: 14 modpacksJun 2026: 10 modpacksJul 2026: 8 modpacksAug 2026: 14 modpacksSep 2026: 18 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 202418
    Nov 202412
    Dec 202423
    Jan 202521
    Feb 202522
    Mar 202513
    Apr 202516
    May 202515
    Jun 202514
    Jul 202514
    Aug 202520
    Sep 202521
    Oct 202514
    Nov 202516
    Dec 202511
    Jan 202616
    Feb 202618
    Mar 202616
    Apr 202613
    May 202614
    Jun 202610
    Jul 20268
    Aug 202614
    Sep 202618

    209 modpacks include Caelum in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    TerraFirmaGreg-Modern1.7M downloadslast version with it 27 Apr 2025All The Mods - Gravitas² 213K downloadslast version with it 19 Apr 2026TerraFirma Rebirth 2133K downloadslast version with it 25 Jan 2025Mystic's Monstrosity84K downloadslast version with it 26 Sep 2024World Terra83K downloadslast version with it 2 Mar 2026TerraFirmaAdventure64K downloadslast version with it 4 Jan 2025Vintage Wilds59K downloadslast version with it 17 Jun 2025Factorio ChunkByChunk +ONLINE (OxMODPACK)41K downloadslast version with it 20 May 2026Hexxit Revived35K downloadslast version with it 21 Sep 2025Knight Craft16K downloadslast version with it 20 Jul 2026
    1 to 10 of 30123

    Often in the same modpacks

    Mods that modpacks often add together with Caelum. Share: how many of the modpacks with Caelum also have that mod.

    ProjectTypeShareGrade
    Sodium Dynamic LightsCModin 55% of the modpacks with CaelumChat HeadsAModin 48% of the modpacks with CaelumAstikorCarts ReduxAModin 44% of the modpacks with CaelumAmendmentsAModin 44% of the modpacks with CaelumAI Improvements: Performance TuningAModin 43% of the modpacks with CaelumsparkAModin 43% of the modpacks with CaelumAttributeFixAModin 40% of the modpacks with CaelumJade Addons (Neo/Forge)AModin 39% of the modpacks with CaelumSinytra ConnectorAModin 39% of the modpacks with CaelumYUNG's Better Nether FortressesAModin 39% of the modpacks with Caelum
    1 to 10 of 29123

    Latest files

    The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.

    MinecraftLoaderVersionSecuritySendsRequires
    1.21.1·NeoForge3.0.0.73.0.0.7 · caelum-3.0.0.7+1.21.1.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·NeoForge, Forge2.0.0.02.0.0.0 · caelum-1.20.1-2.0.0.0.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.18.2·Forge1.0.1.01.0.1.0 · caeulum-1.18.2-1.0.1.0.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.18.1·Forge1.0.0.01.0.0.0 · caeulum-1.0.0.0.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    11 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.1The latest file for its Minecraft version and loader·NeoForge3.0.0.73.0.0.7 · caelum-3.0.0.7+1.21.1.jar (main file)·23 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 372.5 KB
    1.21.1·NeoForge3.0.0.63.0.0.6 · caelum-3.0.0.6+1.21.1.jar (main file)·22 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 366.0 KB
    1.21.1·NeoForge3.0.0.53.0.0.5 · caelum-3.0.0.5+1.21.1.jar (main file)·14 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 365.9 KB
    1.21.1·NeoForge3.0.0.43.0.0.4 · caelum-3.0.0.4+1.21.1.jar (main file)·10 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 371.9 KB
    1.21.1·NeoForge3.0.0.33.0.0.3 · caelum-3.0.0.3+1.21.1.jar (main file)·9 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 371.9 KB
    1.21.1·NeoForge3.0.0.13.0.0.1 · caelum-3.0.0.1+1.21.1.jar (main file)·8 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 371.8 KB
    1.21.1·NeoForge3.0.0.03.0.0.0 · caelum-3.0.0.0+1.21.1.jar (main file)·8 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 371.8 KB
    1.21.1·NeoForge2.0.0.02.0.0.0 · caelum-2.0.0.0+1.21.1.jar (main file)·30 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 252.7 KB
    1.20.1The latest file for its Minecraft version and loader·Forge, NeoForge2.0.0.02.0.0.0 · caelum-1.20.1-2.0.0.0.jar (first file)·31 Jul 2023PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 257.6 KB
    1.18.2The latest file for its Minecraft version and loader·Forge1.0.1.01.0.1.0 · caeulum-1.18.2-1.0.1.0.jar·11 Mar 2022PassedOur checks found nothing harmful in this file. Its code was read too.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 72.7 KB
    1.18.1The latest file for its Minecraft version and loader·Forge1.0.0.01.0.0.0 · caeulum-1.0.0.0.jar·12 Dec 2021PassedOur checks found nothing harmful in this file. Its code was read too.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 54.4 KB

    Quick fixes

    In the last 2 years, 3 releases needed a quick fix: a new release within 3 days to fix a problem. This lowers the grade by 6 points.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.3

    • caelum-3.0.0.4+1.21.1.jar10 Sep 2026Fixed the "black half of the skybox when below the sea…
    • caelum-3.0.0.3+1.21.1.jar9 Sep 2026Fixed solar eclipse Sun/Moon overlap shape Improved…
    • caelum-3.0.0.1+1.21.1.jar8 Sep 2026Fixed the wrong orientation of the sky