English: In astronomy, a parsec is a measurement of distance. It's the distance travelled by light in 3.26 years, or slightly less than 31 trillion kilometres. Looking at an object from two distinct perspectives can be used to calculate a parsec. The computation was done using trigonometry as a mathematical tool.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.