Word of the Day

Phototropism

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

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Last 7 Days

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

Ranidaphobia

Fear of frogs

Cumulus cloud

Fair-weather cloud with flat base and domeshaped top.

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