One billion years to an astronomer
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EONOne billion years, to an astronomer
EONOne billion years to Hubble
eonsunit of geologic time equal to one billion years
aeonsunit of geologic time equal to one billion years
parsecunit of distance equal to that required to cause a heliocentric parallax of one second of an arc, equivalent to 206,265 times the distance from the earth to the sun, or 3.26 light-years
parseca unit of measure for interstellar space that is equal to 3.26 light-years and is the distance to an object having a parallax of one second as seen from points separated by one astronomical unit
parsecsA unit of distance used in astronomy, equal to about 3.25 light years (3.08 Î 1016 meters). One parsec corresponds to the distance at which the mean radius of the earth's orbit subtends an angle of one second of arc