Did you notice that??
Google allows you to choose your favorite theme for your Personalized Google Home page.
There are only 7 themes currently available now.
Here is the preview for Seasonal Scape Theme.
The right panel of this theme says ~
This theme will dynamically change to match your time of day, including local sunrise and sunset times.
Please enter a location (your city and state or zipcode) to update this theme correctly.
Wow! That’s great…. Thanks!! Google