## Sunday, September 13, 2020

### [iqmbzahc] Science not using the metric system

There are 206264.81 astronomical units (au) in a parsec.  There are 3.26 light years in a parsec.

There are 1.1158e+66 electron volts in a solar mass.

There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day.  There are many, many definitions of a year.  For example, a year is exactly 365.25 days (a Julian year) for the purposes of defining a light year.  For a given usage of the term "year" in science, it often takes effort to determine precisely what length of time it means.

What are other examples of science using units that are not metric, or unit multipliers that are not powers of 10?