We get day and night because the Earth spins (or rotates) on an imaginary line called its axis and different parts of the planet are facing towards the Sun or away from it. It takes 24 hours for the world to turn all the way around, and we call this a day. Gaea shows a real-time day and night with lights projected from the inner globe. The outer layer shows the whole globe layout with a transparent outline and the inner layer blocks half of the globe that is currently night time and will spin a full 360 degree in 24 hours (one day).
Sundial Garden Clock, works like a traditional sundial clock, when the sun hits the gnomon, creates a shadow telling the hour of the day. When sun hits the gnomon it reflects a shadow indicating the time.The shadow of the gnomon is reflected on the plate to indicate the time.