Real Stars ✦ Add 1000 brightest star to your night sky

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#1

Real stars

Add 1000* real stars to roblox **(NO SUN)**

Southern sky at Sadao, Thailand
Southern sky at Sadao, Thailand1920×841 63.7 KB

Usage

local starcreator = require(script.Parent.Star) 
local database = require(script.Parent.Star.BStr1000)  

starcreator.LoadArr(database,workspace.Part) 
local latitude = 6.63880 --Set latitude
local longtitude = 100.42340 --Set longtitude
local ttz 

while task.wait() do
	ttz=DateTime.now():ToUniversalTime() --Set time to UTC
	year,month,day,hour,minute,second=ttz.Year,ttz.Month,ttz.Day,ttz.Hour,ttz.Minute,ttz.Second--Expand the time
	year,month,day,hour,minute,second=tonumber(year),tonumber(month),tonumber(day),tonumber(hour),tonumber(minute),tonumber(second)--Deprecated, Used for os.time applications
	starcreator.LoadRot(latitude,90+starcreator.calculateLST(longtitude,year,month,day,hour,minute,second)*15+,workspace.Part)--Rotate workspace.part, 
end

This code will create a realistic sky at Sadao, Thailand at any time according to UNIX timestamp

Documentation

A few function you need to use

starcreator.LoadArr(database : Array , Part : Part)

  • Loads stars from a Database array, around a part as attachment at 2000 studs

starcreator.calculateLST(longtitude : degree , year : Number , month : Number , day : Number , hour : Number , minute : Number , second : Number)

  • Calculates the Local Sidereal Time from longtitude and time precisely

  • Returns Local Sidereal Time in Decimal Hour

starcreator.LoadRot(latitude : degree , 90 + LST : degree , Part : Part)

  • Rotate a part to the appropriate rotation given latitude and LST
  • The 90 Degree is to account for initial rotation of the part that has original rotation as 0,0,0 when loadArr is called on the part

Limitations

  • It is accurate but in no way should be used for real world stuff like navigation

  • Verified by checking with Stellarium Which might be incorrect

  • Might not be correct as I am not sure wheture EOT is accounted for in the LST calculations

  • The daytime and Sun is not included right now, So no sun, No daylight and No Moon

  • No fog or atmosphere at all

  • Stars always visible ( Might fix in da future)

Expanding

Check this Github page, This is the code used to create the JSON data string to be used in Real Stars

License

If used in any public project, just add "Using Real Stars by tin_nim" in description

Get it

Notes

  • Only top 1000 brightest (Apparent Magnitude) stars are added
39 Likes
#2

oooo~ I would love to see how this resource expands in the future!

#3

absolutely beautiful, I would love to see how this progresses in the future. I will be using this system in a future project.

#4

The sun will be added soon

2 Likes
#5

Hi,

image
image919×120 9.73 KB

Shoot, I am out on at sea on my boat, and using Roblox for my navigation system… it say it looks like I am near the Bermuda Triangle from the stars… I have been going in circles for days…

on another note…

  1. Do the stars move across the sky?

  2. You said they are always visible?? even during the day? isn’t there a way of turning them off?

  3. can the star be programmed to move, not relative to the time of day, if that is how they move, if at all ?

Thanks

1 Like
#6

1.Yes it does move across the sky, In the example script however is real time, so it is very slow

2.Yes there is a way to turn them off, Just loop through the part used to store GUIS and change the transparency of image label, I will soon upload a new script that has that feature

3.They move like in real life in the example script, Where changing the Universal Time , latitude and longitude will change the stars position accordingly.

Now currently the star movement is not influenced by day time at all,

while task.wait() do
	ttz=DateTime.now():ToUniversalTime() --Set time to UTC
	year,month,day,hour,minute,second=ttz.Year,ttz.Month,ttz.Day,ttz.Hour,ttz.Minute,ttz.Second--Expand the time
	year,month,day,hour,minute,second=tonumber(year),tonumber(month),tonumber(day),tonumber(hour),tonumber(minute),tonumber(second)--Deprecated, Used for os.time applications
	starcreator.LoadRot(latitude,90+starcreator.calculateLST(longtitude,year,month,day,hour,minute,second)*15+,workspace.Part)--Rotate workspace.part, 
end

In the script as you can see, you can change the rotation of the stars by changing the inputs of the LST function, so for example freezing the star in place you would just delete the looping and input ttz to be a constant
for changing speed or rate, you can do that by changing ttz by some amount for example 2x speed would be

local starttime = .....
while task.wait() do
    local delta = DateTime.now().UnixTimestampMillis - starttime.UnixTimestampMillis 
	ttz = DateTime.FromUnixTimestampMillis(starttime.UnixTimestampMillis  + delta*2):ToUniversalTime()
    --Set time to UTC
	year,month,day,hour,minute,second=ttz.Year,ttz.Month,ttz.Day,ttz.Hour,ttz.Minute,ttz.Second--Expand the time
	year,month,day,hour,minute,second=tonumber(year),tonumber(month),tonumber(day),tonumber(hour),tonumber(minute),tonumber(second)--Deprecated, Used for os.time applications
	starcreator.LoadRot(latitude,90+starcreator.calculateLST(longtitude,year,month,day,hour,minute,second)*15+,workspace.Part)--Rotate workspace.part, 
end
#7

I really hope once this is complete, people will start using it and roblox will make it the default for new games!

1 Like
#8

This is super cool! thanks for the resource.

BTW, the stars show through clouds.

1 Like
#9

That is due to the fact that stars are billboard GUI, which will always show through clouds as the clouds are not actual 3d objects… There is no fix, the only one I can think off is to manually project the stars unto the cloud texture, and manually dim it

1 Like