A phenomenon or process that involves multiple steps and repeats itself

When the full moon passes into Earth's shadow, causing the Moon to appear reddish in color when the Sun, Earth, and the Moon directly line up; lasts 1-3 1/2 hours

The luminous star around which the Earth and other planets revolve: composed mainly of hydrogen and helium

The shape of the illuminated portion of the Moon as seen by an observer, usually on Earth

An obscuring of the light from the celestial body by the passage of an object between the celestial body and the observer or between the celestial body and its source of illumination

The slant of Earth's axis, which if 23.5 degrees from the vertical compared to Earth's orbital plane around the Sun; results in the North Pole always pointing toward the North Star

A celestial body consisting of a mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior.

A curved path followed by a satellite as it revolves around an object

The four natural divisions of the year based on changes in temperature due to varying amounts of sunlight received (both intensity and number of daylight hours vary); caused by the tilt of Earth during its revolution

When the Moon passes between Earth and the Sun, covering all or part of the Sun; occurs when the Sun, the Moon, and Earth directly line up; lasts for less than 12 minutes

A star and the group of planets and other celestial bodies that are held by its gravitational attraction and revolve around it

A celestial body that revolves around a planet