Astrogation, Astronavigation
Astrography 2
Image from Chris Shaeffer
Plotting a course for a ship through interplanetary and interstellar space.

Astrogator - the person or subroutine that has the task of safe navigation of a ship.
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    Astronomical Unit - the mean distance of the Earth to the Sun (SolSys), about 1.496 x 108 km (150 million km), 8.3 light minutes, 1.582x10-5 light years, or 4.847x10-6 parsecs. Standard interplanetary measurement.
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    The distance light travels in one standard or metric (Earth) year, viz. 9.46x1012 km. Standard unit of measurement. It is equal to 6.323x104 astronomical units (AU) or 0.307 parsecs.
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    Unit of distance at which a star would have a parallax of 1 second of arc from a planet of exactly 1 astronomical unit (AU) distance from its primary. One parsec is equal to 3.262 light-years, 2.063x105 AU, or 3.085678 x1013 kilometers.
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Development Notes
Text by M. Alan Kazlev
Initially published on 07 October 2001.