incontinent
Using the stars (and planets) to predict future events on Earth is called Astrology. There aren't many who would still call it a "science," though.
In ancient Egypt their astronomers use the stars to predict when the Nile River would flood.
A person who makes of
collecter
A person who looks on the gloomy side of things is pessimistic.
A person who builds things out of stone is called a stonemason or a stoneworker.
A person who hoards things that you have would be called..."you." Or whatever your name is.
You could call them generous or a recipient or a patron.
An idiot.
A snuggler
Smart