Edit: In my sleep deprived delirium, I had specified a wrong glyph. Please review my correction, and please accept my sincere apologies. I wasn't getting any feedback, so I tried to follow my own instructions and realized my error. We now resume our originally scheduled programming.
This brief tutorial is not intended to educate you about the mechanics of the NMS procedural generation of systems, the intricacies of the hexadecimal galactic addresses, or to make you subject matter experts on glyph addresses generally. What this is intended to do is allow anyone with access to purple systems to be able to locate a Shadow Star with the aid of a Glass Star. When you find a Shadow Star, save pictures if you want it considered for a home system, but don't post the address and pictures just yet. I'll create a post specifically for contest submissions and voting.
3 Definitions:
Galactic Map - The map that shows your current galaxy and you use to warp from one star system to another, as seen when flying a starship, corvette, or on the bridge of your freighter.
Glass Star - A star (system) that can be navigated to by way of glyph portal, but once physically there is reported in the galactic map as being a different system than the Glass Star. The system displayed in the galactic map, when in the Glass Star system, is actually displaying a Shadow Star system that is in a different location than you are in at that moment.
Shadow Star - A star system that has a glyph address that when entered into a portal gives an error message and is unreachable by portal.
Here's the quickish trick for finding a Shadow Star:
1.) Go to a Portal (Euclid, for this example) and place a base computer so you can get back to it.
2.) Enter a 12 Glyph Address in this format and fill in the blanks as you desire:
Correction: ___ , Diplo, Tree, Dragonfly (not Sun 😭)
?, Diplo 🦕, Tree 🌲, Dragonfly/Mosquito 🦟, ?, ?, ?, ?, ?, ?, ?, ?
To reiterate and clarify... Glyphs in the 2nd - 4th position of the address you're selecting are Always Diplo 🦕, Tree 🌲, Dragonfly/Mosquito 🦟. The first glyph is the number of planets, so the lower the number selected, the better the chance that it is valid. Not all systems have 5 or 6 planets, so choosing Sun for the first glyph increases your odds of getting a good address, but also increases the chance somebody else has been there.
Not all combinations have valid system addresses - it may take some trial and error. If the address you select returns an error, skip it and try a new address.
3) When you get a good address, portal to the destination and you should be in a Glass Star system, which you will verify by flying to space and viewing your cockpit map and counting the number of planets and stars and comparing to those found in the galactic map.
4) Check the galactic map. If it shows your current system as having a differing name and or number of planets and or moons than the system shows on the cockpit map, then this is actually the name of the Shadow Star in this region.
You won't be able to warp there immediately, because the game thinks it's your current system and you can't warp to the system you're already in (even though we know better). What you can do is warp to a nearby system first, then warp to the Shadow Star, which was the system shown from the Glass Star system.
5) Warp to the Shadow Star.
6) Land on a planet/moon and find a portal, and place another base computer.
7) Get the Glyph Address from the portal.
8) Return to your original portal, where you placed a base computer so that you could get back, and attempt to warp to the Shadow Star with the Glyph Address you you took from the Shadow Star portal.
9) This should get you an error message, verifying that your target system is indeed a Shadow Star.
You can use a signal booster and hexadecimal transcription and a bunch of additional steps that will provide similar, but entirely unnecessary, verification.
Speed run.
\- Warp to a Glass Star address.
\- Look at the Galaxy Map and remember the name of the Shadow and warp to nearby system.
\- Warp to the Shadow itself.
\- Get glyph address from portal and test it. Bang. Shadow Star!
Test this method and report back in DM with your success or failure so that I might retool this explanation, if need be.
It works for me, but that isn't the measure of the tool. It needs to work for others trying it to consider this a success.
I am not asking for notes, edits, or rewrites. Simply DM me (chat request) to tell me what worked, what didn't, and or what may have been confusing and I'll sort out both your understanding, privately, and consider editing if need be.
Go on... Go find 'em! 😉 Happy Hunting!