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Measuring the Universe by the International Astronomical Union
Codex
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@codex,
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Physics
Physics bibliography
Earth and space physics bibliography
2026-11-05
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iauarchive.eso.org/public/themes/measuring/
Official IAU educational
explanation
, The
light-year
and Defining
a
year
:
vacuum
propagation over
a
Julian
year
of 365.25
days
, or 31557600
seconds
.
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(4)
Earth and space physics bibliography
Physics bibliography
Physics
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Julian year
Light-year
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