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Stratus cloud

Thin, gray sheet-like cloud with low base; may bring drizzle or snow.

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Lenticular Cloud

Lenticular clouds are only seen around mountains. These strange clouds are easy to spot, because they look like flying saucers or a stack of pancakes. Their most interesting characteristic is that they don't move. Winds blow right through them, while other clouds are swept away.

Psychrometer

An instrument used for measuring the water vapor content of the air.

August

Named to honor the first Roman emperor (and grandnephew of Julius Caesar), Augustus Caesar (63B.C.-A.D.14).

Brontophobia

Fear of lightning/thunder

Evening star

A planet that is above the western horizon at sunset and less than 180° east of the Sun in right ascension.

Lenticular Cloud

Lenticular clouds are only seen around mountains. These strange clouds are easy to spot, because they look like flying saucers or a stack of pancakes. Their most interesting characteristic is that they don't move. Winds blow right through them, while other clouds are swept away.

Perihelion

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

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