Nadir

Nadir

An imaginary point directly under an observer on the surface of the Earth, extending through the Earth and into the sky.

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Part of Speech: noun
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Industry/Domain: Astronomy
Category: Moon
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Related terms

nadir

Weather; Meteorology

1. Satellite subpoint on the earth's surface that is centered directly below the satellite. This is also referred to as the point of zero nadir angle for a satellite in earth ...

nadir

Natural environment; Coral reefs

The satellite viewing angle directly downward; that point on the Earth vertically below the observer (satellite); the lowest point of a dry basin or depression, or the deepest ...

nadir

Astronomy; Mars

The point on the celestial sphere that is diametrically opposite the zenith, so that the zenith, nadir and center of earth are in one straight line. It is always 90 degrees below ...

nadir

Aerospace; Satellites

That point on the celestial sphere vertically below the observer (i.e. the point on the Earth directly below an orbiting satellite), or 180° from the zenith.

nadir

Astronomy; Moon

An imaginary point directly under an observer on the surface of the Earth, extending through the Earth and into the sky.

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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