During the day the Sun can be seen in the sky, unless obscured by clouds. In the night sky (and to some extent during the day) the moon, planets and stars are visible in the sky. Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. Lightning and precipitation can also be seen in the sky during storms. On Earth, birds, insects, aircraft, and kites are often considered to fly in the sky.

The sky can turn a multitude of colors such as red, orange, purple and yellow (especially near sunset or sunrise) and black at night. Scattering effects also partially polarize light from the sky, most pronounced at an angle 90° from the sun.

The sky makes the earth more amazing than other planets, the Calendar Sky theme package for Flip programs are designed with the stunning sky images. Enjoy the colorful sky templates to build nice page-flipping ebooks, and remind readers to protect the environment to see the beautiful sky forever.

Details about using themes in Flip programs >>