from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A former
standard astronomical time scaleintended to overcome the drawbacksof irregularly fluctuating mean solar time, superseded in the 1970s.
- noun astronomy A modern
relativistic- coordinate time scale.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
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