Got this word from Dan Brown, The Lost Symbol
Similar to everyone, I had the impresion this word was only used for things related to cults or mysterious unexplainable events or objects.
However, according to free dictionary, it can be used as follows –
To become concealed or hidden from view or have its light extinguished;
“The beam of light occults every so often”
Although there was another meaning as well seen below –
occult – supernatural practices and techniques;
“he is a student of the occult”