Word of the Day

Celestial equator

The circle around the celestial sphere that is halfway between the celestial poles. It can be thought of as the plane of Earth’s equator projected out onto the sphere.

Last 7 Days


    Fear of frogs


    Wisconsin was probably named from a Chippewa word that means "river of red stone" or "river of the great rock."


    Fear of vegetables


    Sometimes clouds look like other objects, such as dragons, elephants, letters, and even people. Cloud naming is called nephelococcygia.


    Someone who knows more and more about less and less. - Anonymous


    The difference in degrees between the celestial longitudes of a planet and the Sun. Greatest Elongation (Gr. Elong.): The greatest apparent distance of a planet from the Sun, as seen from Earth.


    The interval of time following sunset and preceding sunrise, during which the sky is partially illuminated. The three ranges of twilight are: civil (from sunset/sunrise to when the Sun is 6° below the horizon) nautical (greater than 6° and ending at 12°) astronomical (greater than 12° and ending at 18°—full darkness).

    Solar Cycle

    A period of 28 years in the Julian calendar, at the end of which the days of the month return to the same days of the week.


    Arranged in a manner befitting a ship; hence, trim; tidy; orderly.

Syndicate content