calc_delta_time.md

calc_delta_time.py

• Calculates the difference between universal time and dynamical time (TT - UT1) following Richard Ray's PERTH3 algorithms

Calling Sequence

from pyTMD.calc_delta_time import calc_delta_time
deltat = calc_delta_time(delta_file, iMJD)

Inputs

1. delta_file:
   • http://maia.usno.navy.mil/ser7/deltat.data
   • ftp://cddis.nasa.gov/products/iers/deltat.data
2. iMJD: Modified Julian Day of times to interpolate

Outputs

• deltat: (TT - UT1) in days