Word of the Day

Nimbostratus cloud

Dark, shapeless cloud layer containing rain, snow, and ice pellets.

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Homichlophobia

The fear of fog or clouds

Dewpoint temperature

The temperature to which a given parcel of air must be cooled before it becomes saturated; the temperature of an object when dew first forms on it.

Perihelion

The point in a planet’s orbit that is closest to the Sun.

December

From the Latin word decem, "ten," because this had been the tenth month of the early Roman calendar.

Staunch

Strong and tight; sound; firm; as, a stanch ship.

Pyrheliometer

An instrument that measures direct solar radiation.

Altostratus cloud

Grayish or bluish layer of clouds that can obscure the Sun.