Ephemeris time (ET)

Ephemeris time (ET)

A measurement of time defined by orbital motions. Equates to Mean Solar Time corrected for irregularities in Earth's motions. Obsolete, replaced by TT, Terrestrial Time.

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Part of Speech: noun
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Industry/Domain: Aerospace
Category: Space flight
Company: NASA
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ephemeris time (ET)

Astronomy; General astronomy

Determined in principle from the sun's apparent annual motion, ET is the numerical measure of uniform time, which is the independent variable in the gravitational theory of the ...

ephemeris time (ET)

Aerospace; Space flight

A measurement of time defined by orbital motions. Equates to Mean Solar Time corrected for irregularities in Earth's motions. Obsolete, replaced by TT, Terrestrial Time.

lunar probe

Aerospace; Space flight

A lunar probe is a scientific space exploration mission in which a man-made spacecraft is sent into the Moon orbital space. China launched its latest lunar probe, the Chang'e-2, ...

estimated approach time

Aerospace; Space flight

The time at which air traffic control (ATC) expects that an arriving aircraft following a delay will leave the holding point.

Discovery

Aerospace; Space flight

The oldest of NASA's three surviving space shuttles, Discovery’s maiden voyage was in 1984. It made both return-to-flight missions following the Challenger and Columbia disasters, ...

Kwant 2

Aerospace; Space flight

Kwant 2 was a module of the Soviet space station MIR.

Kwant

Aerospace; Space flight

Kwant was a module of the Soviet space station MIR.

Laika

Aerospace; Space flight

Laika was a dog that was sent to space by the Soviet Union. She is the first animal that was sent to space.

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