Yes, the astronomy alias is loaded, as are the actors, archimages and artwork aliases.
If there's no problem with the latter three, then there's only a problem with astronomy!
Does the folder C:/wamp64/_astronomy/ exist?
Are the files there?
Reset the log files using Wampserver's built-in tools, then once you've identified the problem with the astronomy alias, check the apache_error.log and access.log log files.
In access.log, when the "images" are correctly loaded, there's a code 200 :
127.0.0.1 - - [07/Sep/2023:08:44:10 +0200] "GET /wampthemes/classic/img/gifLogo1.gif HTTP/1.1" 200 2681
127.0.0.1 - - [07/Sep/2023:08:44:10 +0200] "GET /wampthemes/classic/img/pngFolderGo.png HTTP/1.1" 200 694
127.0.0.1 - - [07/Sep/2023:08:44:10 +0200] "GET /wampthemes/classic/img/pngWrench.png HTTP/1.1" 200 741
---------------------------------------------------------------
Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons