The zip likely contains Tcl/Tk scripts. SkyCat is famous in the dev community for its extensible architecture, allowing you to write your own plugins to filter astronomical data. Access to Data Sources and the ESO SkyCat Tool - NASA ADS
If your zip is from the SkyRoof community , it’s a tool for hobbyists to automate their backyard observatories, ensuring their telescope "talks" to their roof and sky charts seamlessly. 4. How to Use the Data
Use the unzip -l SkyCat_2023-01.zip command in your terminal to see a full manifest of the astronomical catalogs or scripts included.