As of September 2014, there are three more blood moons expected to occur within the next two years. They are predicted to occur on Oct. 8, 2014, April 4, 2015, and Sept. 28, 2015. More »

In astronomy, the term blood moon refers to a complete lunar eclipse which causes the moon to appear red. The moon looks red due to dispersed light from Earth's sunrises and sunsets that is refracted back onto the moon's... More »

To find the date of the next blue moon, consult a blue moon calendar such as the ones at or Since the term "blue moon" refers to the second full moon in a single month, you can also determine ... More » Science Astronomy Our Moon

Tidal energy comes from the rising and falling of oceanic tides, where water moves because of the gravitational relationship between the Earth and the moon. The Earth's rotation is also a component of tidal energy. Tidal... More »

Tides are formed by a combination of gravitational attraction from the moon and the sun, as well as the centrifugal force generated by the rotation of the Earth. The position of both celestial bodies affects the surface ... More »

Tides are primarily driven by the gravitational forces of the sun and the moon. Low tide, when the water is lowest at the location of interest, occurs at different times in different locations. As the moon orbits earth, ... More »

Tides occur when the gravity of the moon partially cancels out Earth's gravity, allowing a bulge to form in the water on Earth's surface. One high tide occurs directly underneath the moon, while another occurs on the opp... More » Science Weather & Tides