text: #!/usr/bin/env python
  #
  # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  #
  #                               Michael A.G. Aivazis
  #                        California Institute of Technology
  #                        (C) 1998-2003  All Rights Reserved
  #
  # <LicenseText>
  #
  # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  #
  
  from SI import second
  from SI import pico, nano, micro, milli
  
  
  #
  # Definitions of common time units
  # Data taken from Appendix F of Halliday, Resnick, Walker, "Fundamentals of Physics",
  #     fourth edition, John Willey and Sons, 1993
  
  picosecond = pico*second
  nanosecond = nano*second
  microsecond = micro*second
  millisecond = milli*second
  
  # aliases
  
  s = second
  ps = picosecond
  ns = nanosecond
  us = microsecond
  ms = millisecond
  
  # other common units
  
  minute = 60 * second
  hour = 60 * minute
  day = 24 * hour
  year = 365.25 * day
  
  
  # version
  __id__ = "$Id$"
  
  #
  # End of file
  