Word of the Day

Moon’s phases

The continually changing appearance of the Moon, caused by the different angles at which it is illuminated by the Sun. First Quarter: The right half of the Moon is illuminated, as seen from the Northern Hemisphere. Full: The Sun and the Moon are in opposition; the entire disk of the Moon is illuminated as viewed from Earth. Last Quarter: The left half of the Moon is illuminated, as seen from the Northern Hemisphere. New: The Sun and the Moon are in conjunction; the entire disk of the Moon is darkened as viewed from Earth.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

Last 7 Days

Node

Either of the two points where a body's orbit intersects the ecliptic. Ascending: The body is moving from south to north of the ecliptic. Descending: The body is moving from north to south of the ecliptic.

Phototropism

The effect of light on the direction of growth of a plant.

Right ascension

The celestial longitude of an object in the sky, measured eastward along the celestial equator in hours of time from the vernal equinox; analogous to longitude on Earth.

Julian period

A period of 7,980 years beginning January 1, 4713 b.c. Devised in 1583 by Joseph Scaliger, it provides a chronological basis for the study of ancient history. To find the Julian year, add 4,713 to any year.

Windbag

A boring person who talks a great deal about uninteresting topics.

Epact

A number from 1 to 30 that indicates the Moon’s age on January 1 at Greenwich, England; used for determining the date of Easter.

Ombrophobia

The fear of rain

Subscribe to Word of the Day