Zenith

That point, on any given observer's celestial sphere, that lies directly above him; the point that is elevated 90° from all points on a given observer's astronomical horizon. ...

zenith

Astronomy; Mars

The point of the celestial sphere directly overhead, 90 degrees above the horizon, for any point on earth; it is the point where a plumb line extended upward would intersect the ...

zenith

Education; SAT vocabulary

The culminating-point of prosperity, influence, or greatness.

zenith

Aerospace; Satellites

The point in the celestial sphere that is exactly overhead. Contrast with nadir.

crescent moon

Astronomy; Moon

The moon when it appears partly but less than one-half lit. It is seen between a new moon and a half moon.

gobbous moon

Astronomy; Moon

The Moon when it appears more than half lit but less than fully lit. It happens between full moon and half moon.

new moon

Astronomy; Moon

The Moon when it is not visible or when it is visible only as a thin crescent, is named as new moon.

moon

Astronomy; Moon

The round object that moves around the Earth at a distance of about 240,000 miles. Moon is one-fourth the size of the Earth.

S/2012 P 1

Astronomy; Moon

S/2012 P 1 is a small natural satellite of the planet Pluto. The moon was discovered on July 11, 2012. It is the fifth satellite of Pluto to be confirmed. The other four Pluto ...

phase

Astronomy; Moon

One of the ways that the moon appears depending on how much of its sun-lit surface is visible.

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Industry/Domain: Geography Category: Countries & Territories

Tahiti

Tahiti is the largest island in the Windward group of French Polynesia, located in the archipelago of Society Islands in the southern Pacific Ocean. ...