so far only had one constellation visible but a after one cycle it disappeared and never came back
created a new testing world and discovered every constellation by command but still non showed up while searching for them or even in the sky.

Upload your astralsorcery.cfg file, please. Also, what pack?

custom private pack i run for friend that i manually distribute
mod list:
astralsorcery-
AutoRegLib-
Baubles-
Botania
Chameleon-
CoFHCore-
CoFHWorld-
coroutil-
cucumber-
CyclopsCore-
EvilCraft-
FluidConverters-
Hwyla-
iceandfire-
industrialcraft-
ironchest-
Jei-
JurassiCraft-
JustEnoughResources-
llibrary-
MagicArsenal-
Mantle
MorePlayerModels_1.12.2
mysticalagriculture-
NetherEx-
plustic-
ProjectE-
Quark-
RedstoneFlux-
Reliquary-
Ruins-
TConstruct-
Thaumcraft
ThaumicInventoryScanning_1.12.2-
thaumicperiphery-0.2.3
ThermalFoundation-
torohealth-
Totemic-
UniDict-
VeinMiner-
WanionLib-
Wawla-
Waystones_1.12.2
zombieawareness-

astralsorcery.zip

What's the constellation tab of your Tome look like inside? Specifically the constellations? Just one or two is fine, don't need all 16.

this is what they used to look like
don't know what happened but after 4 RL (as seen in the earlier screenshots) days it somehow fixed it self and seem to be working normally right now

¯\(ツ)/¯