It is certainly possible that ghosts can know when you can see them. One of the many beliefs about ghosts is that they only appear at times when they have a particular reason, such as someone's last time, their date of death, or the need to deliver a message to them.
Moreover, some beliefs also hold that ghosts usually appear only at night, while during the day they are lethargic. This means you can see them more easily at night.
Some believe that ghosts can also be influenced by places, such as houses, old buildings, or elsewhere. Ghosts are more likely to be affected in these locations, which can cause them to appear more easily.
Some beliefs also hold that ghosts can usually be influenced by people with whom they may have been someone attempting to associate their death. So, if you have an acquaintance who died and you do an activity related to him, ghosts may be likely to see you.
In addition, some beliefs also assume that ghosts can be influenced by just people they know or with whom they have some kind of relationship. So, if you have an acquaintance who affects you after death, ghosts may likely see you.
Finally, all this is the final verdict of beliefs that ghosts can know when you can see them. It depends on you whether you are in a ghostly place, with an acquaintance you have a relationship with, or doing an activity that may affect ghosts.
