A configurable astronomy mod that adds a realistic night sky with real life stars, planets and much more. This mod is for those who want to explore the stars while playing minecraft. ## Features - Real life constellations and stars - Planets and their moons - Realistic sun and moon positions, longer days or nights throughout the seasons - Shooting Stars with annual Meteor Showers - The Milky Way, galaxies, nebulae, and clusters - Rare astronomical events such as eclipses - Makes the spyglass useful - Full customizability, with custom planets ### Stars Astrocraft replaces Minecraft's default stars with stars from real life. Stars retain their vanilla-style, but with variation in hues, some being more reddish, others blue. If you are familiar with any constellations, you can now find them in-game. All of these stars revolve around the north star (Polaris): ![Stars revolve around the north pole](https://cdn.modrinth.com/data/cached_images/f7f9e73894fa79248de3b7d53a529277c579f5d2.gif) ### Galaxies, Nebulae, Clusters The milky way is faintly visible at night, along with numerous other deep-sky objects. These include massive galaxies like Andromeda and Triangulum, or smaller planetary nebulae like the Ring Nebula. The Milky Way and other deep-sky objects become brighter and more visible at high altitudes, like on a mountain peak. New objects are added each update. ### Shooting Stars / Meteor Showers At night, you can occasionally see streaks of light shoot across the sky. These are meteors, which usually belong to a meteor shower, where multiple will appear to radiate from the same point in the sky. Some are sporadic, not associated with any shower. Meteors showers occur at predictable times each year, the Perseids for example, are visible around the middle of summer. Occasionally, certain meteor showers can even produce "meteor storms". Below are a few meteor showers (there is actually over 30): |Name |Radiant |MC Day of peak| |-------------|-------------------|--------------| |Lyrids |Lyra |33 | |Eta Aquariids|Aquarius |46 | |Perseids |Cassiopeia, Perseus|142 | |Orionids |Orion |211 | |Leonids |Leo |239 | |Geminids |Gemini |266 | |Quadrantids |Boötes |287 | ### Spyglass The spyglass is an essential tool for exploring Astrocraft's skies, as it lets you observe an area of the sky in greater detail. It increases the brightness of stars, and shows objects that would otherwise be too dim to see. How effectively the spyglass works depends on multiple factors, such as Y position or the angle above horizon (altitude). Therefore, it is better to climb a mountain to observe very dim objects.

Planets / Solar System Objects

By default, this mod adds all major planets, along with many other objects in the solar system. Planets are rendered similar to stars when not zoomed in, although typically brighter, larger and more vividly colored. Unlike stars, planets move against the fixed background of stars, traversing the zodiac as the days go by. The positions of these planets in the sky are calculated from their orbital parameters (fully configurable), while also taking into account earth's own orbit. These include: - Semi-Major Axis - Orbital period - Eccentricity - Inclination - Obliquity / Axial Tilt (For moons of planets) - Precession The brightness or size of a planet is calculated using: - Absolute Magnitude (H) - Distance to Earth / Observing Planet - Distance to the Sun - Phase Angle (Different phase curve models are used for different planets) Satellites of planets (including The Moon) or even the Sun use the same algorithm. When the angular diameter of a planet exceeds a certain size, the mod switches from star-like rendering to vanilla-moon-like rendering. ![Four planets forming a straight line. From left to right: Venus, Mars, Jupiter and Saturn.](https://cdn.modrinth.com/data/cached_images/ac5a7a9ec3a779411e640518d85357435168751a.png) Using a spyglass allows you to see stars, planets, asteroids or moons that are too faint to see with the naked eye. In some cases, large planets can be rendered with a texture, some showing phases like the moon (this is the case with Venus). ![Jupiter + 4 moons viewed using a spyglass](https://cdn.modrinth.com/data/cached_images/b0b89fca01e2c1e2ac67bbe4d17b02fe2c3993bf.png) ![Uranus (blue star)](https://cdn.modrinth.com/data/cached_images/4e293db2ff014954ecfe72861641d63ca695a5cb.png) ![The Pleiades (Seven Sisters, Messier 45)](https://cdn.modrinth.com/data/cached_images/a1b05f92b9443f7a2f3a1324151f9a60d135bb99.png) Below is a table of the planets (except Earth), with descriptions of their in-game appearances: |Planet |Brightness |In-game Color|Notes | |-------|-----------|-------------|----------------------------------------------------| |Mercury|Bright |White |Visible at sunrise / sunset | |Venus |Very Bright|White |Visible before sunrise / after sunset | |Mars |Dim-Bright |Orange |Much brighter at opposition | |Jupiter|Bright |Yellow-Brown |Four moons visible using a spyglass | |Saturn |Dim |Yellow-Green |Shows rings with enough zoom | |Uranus |Very Dim |Cyan |Usually requires a spyglass to see | |Neptune|Very Dim |Blue |Requires a spyglass to see | Over 100 asteroids have also been added, including Vesta and Ceres. These appear similar to dim stars. ### Moons Both Jupiter and Saturn have easily observable moons. In a spyglass, they look like stars revolving around the planet. You can see moons move around over a single night, as they often have short orbital periods. You can also see the moons of Mars, Uranus, and Neptune with some difficulty. ### Big Planets Mode This option scales up the planets and renders planets using textures like the MC moon, rather than more realistic star-like rendering. ![Saturn, Jupiter and Mars shown besides eachother, rendered using moon-style textures](https://cdn.modrinth.com/data/cached_images/30abbf146af0946b5b2925af79faf4475d04ebe2_0.webp) ### See space from other planets Using the "Observing Planet" option, you can easily switch the perspective from Earth to any added object in the solar system, including planets, moons, asteroids or even the sun. This shows you how other planets / moons appear from planets other than Earth (like Earth from Mars, or Jupiter from Europa). It also simulates how lighting changes as you get further from the sun (try Pluto). ### Configuration + Custom Planets Planets are fully configurable, you can edit existing planets or even add your own. |Orbit Option |-| |-------------------------|-| |Semi Major Axis (AU) |This is how far from the sun the planet orbits, ignoring eccentricity| |Orbital Period (years) |How many earth-years it takes for the planet to complete an orbit | |Inclination (deg) |The angle which the orbit is tilted by | |Eccentricity (0.0 to 1.0)|The shape of the orbit and deviation from a circle (e: 0.0) | |Appearance Option |-| |-------------------------|-| |Absolute Magnitude (H) |The planet's brightness, lower values are brighter | |Texture |Which texture to render the planet using | |Rings |Whether or not the planet should be rendered with rings (like Saturn)| |Red / Green / Blue |The planet's color | You can also add or remove moons to each planet, which are editable just like planets. Below shows a custom planet so big that it is visible during the day: ![Adding a custom planet](https://cdn.modrinth.com/data/cached_images/eecf5189f29b4d130b111b8512b44874a2c1d0ef.png) ![The resulting custom planet](https://cdn.modrinth.com/data/cached_images/cd252d128e9f5c04443d7aaee9a1485c11bad28d.png)

Changes to the Sun & Moon

### Positions in the Sky Unlike in vanilla minecraft, where the sun, moon pass overhead, they are instead tilted by the latitude set in the configuration (30°N by default). Additionally, the sun's path is also affected by its declination which changes throughout the year cycle (365 ingame days by default). Disable the 'Tilted Sky' setting in the config for vanilla behavior. Throughout the year, the sun moves relative to the stars, travelling through the zodiac. This determines which stars can be seen at a given time. ### Changing Day / Night Lengths Times of sunrise / sunset are also affected by the sun's declination, with longer days and shorter nights during the summer, and the opposite during the winter. Setting latitude to 90° or -90° in the configuration will simulate the polar day / night experienced at the poles. ### The Moon The moon's position relative to the sun will depend on the moon's phase. At full moon, the moon stays opposite the sun, just like in vanilla minecraft. However, during a crescent phase, the moon will appear just to the left or right of the sun, and can be seen during the day. This mod also adds moonlight, which lights up the night around the full moon. ![Both the sun and moon up during daytime](https://cdn.modrinth.com/data/cached_images/15dc377a26c00d07ef068daaa12fbecb118aabbb.png) ### Eclipses A lunar eclipse occurs when a full moon coincides with the moon crossing the ecliptic, the moon turns red and moonlight dims. During a new moon, the moon can partially or fully cover the sun, blocking out the sunlight and dimming the sky until it is just like nighttime. Other astronomical objects, such as Mercury and Venus also eclipse the sun, which you can observe as a small black spot traversing the sun's disk. ![Annular Eclipse](https://cdn.modrinth.com/data/cached_images/b014f79b516a4e399ca4cc8c9ac96fa47490056f.png) ![Lunar Eclipse](https://cdn.modrinth.com/data/cached_images/ca5b6b86b4be56f3dfad22615a3c0894d3171100.png) ![Transit of Venus](https://cdn.modrinth.com/data/cached_images/eb1b7372157e1f73ce68e57e23f8837d4abbf331.png)

Customization

If you have mod menu installed you can open the configuration menu, otherwise edit the config file at: "config/astrocraft.json". Here you can toggle stars or planets off, reduce star coloring, add your own stars and planets, and much more. ### Magnitude Limit This is the main option affecting performance, it changes how many stars are shown. Increase to 6 for a more detailed night sky. Reduce if you have performance issues, or you want to simulate urban light pollution. ### Year Length Default "Year Length" is 365.25 minecraft days, this also affects the orbital period of every planet / moon. On singleplayer worlds, this may be too slow for you, so you can reduce it to something like 100 days. ### Multiplayer Compatibility Positions of planets and stars are calculated from the world time, therefore other players on the same world will see the same stars and planets as you. This won't be the case if you change certain settings, such as "year length" or most settings in the "Planets" category. ### Overlays and Constellations In the "Overlays" categories, you can enable overlays rendered over the sky. The "Show Constellations" option, helps you see constellations by drawing lines between stars, showing which stars make up each constellation. There are also options to show a grid or the ecliptic. ### Other - Setting the latitude to a value above 90° will activate dynamic latitude (latitude is decided based on Z coordinate. A globe can be simulated by setting latitude to how many blocks away the poles are from the equator on your hypothetical globe. The stars will now tilt as you walk north or south. - Background stars can be edited using resource packs, at "assets/astrocraft/stars". If you only want to add a few stars, use the custom star list in the menu. ![Config Menu](https://cdn.modrinth.com/data/cached_images/3661974d7ff82ec77edc1f957c917b9ed4c4041b.png)

Mod Compatibility

Please read through this section if you use other mods, especially if you are a modpack creator. ### Incompatible These mods will not work or crash with Astrocraft: - Fabric Skyboxes - Blinking Stars ### Forge Use Sinytra Connector if you want to it use with forge. There will probably not be a forge version anytime soon. Older versions of Sinytra / Forge Loader may turn the sky blood red, so make sure to keep these updated. ### Shaders May have a lot of visual bugs, such as duplicated suns and moons, ugly stars, etc. ### BadOptimizations Important: Set "enable_sky_angle_caching_in_worldrenderer" to "false" in the BadOptimizations config file at "config/badoptimizations.txt" Otherwise, the sun and sky will move back and forth in weird directions. ### AdditionZ Disable AdditionZ's Polar Star. ### Enchanced Celestials Enable "Legacy Moon Mode" under "Advanced". Blood moons will not coincide with Astrocraft lunar eclipses, you may want to disable eclipses in Legacy Moon Mode's options to prevent confusion. ### Season Mods (Serene Seasons, Fabric Seasons, etc.) You may want to manually line up Astrocraft's seasons with the mod's seasons, using the options "Year Length" and "Starting Season", both under "Planets". Alternatively you can change the other mod's config too. For default config Serene Seasons: - Set "Year Length" to 96 For default config Fabric Seasons: - Set "Year Length" to 112 ### Ad Astra Astrocraft's skies won't show up on other planets. There is [a mod](https://modrinth.com/mod/astrocompat) by [mynameisjeffitowastaken](https://modrinth.com/user/mynameisjeffitowastaken) to fix this, which also automatically changes the Observing Planet option to match your current planet.

If you have any issues, contact the mod author pymsrps, and post the full logs.

Astrocraft: Ad Astra Compat

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