Retirement of maptools

[rogerssam]

Hello,

I am assisting in developing a package that depends on maptools (specifically the sunriset method). Loading the package displayed a warning about impending deprecation of the package, and pointed to this blog: https://r-spatial.org/r/2023/05/15/evolution4.html
However it's not clear where (if anywhere) those functions have been rehomed. Is someone able to provide some guidance? I'm happy to contribute with pull requests if that's helpful.

Apologies if this is not the correct place for this question, but hopefully someone can help.

Thank you!