pyacs.lib.astrotime

AstroTime: time conversions (calendar, MJD, decimal year, datetime).

Traduction from perl module Astro::Time (CPAN, Chris Phillips). Conversion to Python by Jean-Mathieu Nocquet (Geoazur). Routines for calendar dates, Modified Julian day, UT/local sidereal time, and numerical/string angles. String functions removed. Datetime support added.

Notes

This module is for date manipulation; leap seconds are not handled. See the GPSTime module for GPS/UTC conversions. In Python 3.6+, / was changed to // for integer operations. All conversions not specifying ut or uts use 12h00mn00s as default; ut is the decimal fraction of day, uts is seconds since 00h00m00.0s.

cal2datetime	Convert a calendar date to a Python datetime instance.
cal2dayno	Return the day of year (doy).
cal2decyear	Convert a calendar date to decimal year.
cal2mjd	Convert a calendar date (universal time) to modified Julian day (JD-2400000.5).
datetime2cal	Convert Python datetime to calendar date.
datetime2dayno	Convert Python datetime to day of year, year, and day fraction.
datetime2decyear	Convert Python datetime to decimal year.
datetime2mjd	Convert Python datetime to modified Julian day.
datetime2seconds	Convert datetime to seconds since 1980-01-01 00:00:00.
datetime_from_calarray	Build a datetime array from an array of calendar dates.
datetime_round_second	Round a Python datetime instance to the nearest second.
day_since_decyear	Calculate the number of days since a reference decimal year.
dayno2cal	Return the day and month corresponding to day of year.
dayno2datetime	Convert day of year and year to a Python datetime instance.
dayno2decyear	Convert day of year and year to decimal year.
dayno2mjd	Convert day of year and year to modified Julian day (JD - 2400000.5).
decyear2cal	Convert decimal year to calendar date.
decyear2datetime	Convert decimal year to a Python datetime instance.
decyear2dayno	Convert decimal year to day of year and day fraction.
decyear2epoch	Convert decimal year to formatted epoch string 'yy:doy:sec' (%02d:%03d:%05d).
decyear2mjd	Convert decimal year to modified Julian day.
decyear2seconds	Convert decimal year to seconds since 1980-01-01 00:00:00.
epoch2decyear	Convert SINEX-format epoch string 'YY:DOY:SOD' (e.g. '17:100:43185') to decimal year.
gpsweek2mjd	Convert GPS week and day of week to modified Julian day.
guess_date	Guess a date from input (string or float) and return decimal year.
hmsmicros2ut	Convert hours, minutes, seconds, microseconds to fractional day.
hmsmicros2uts	Convert hours, minutes, seconds, microseconds to seconds since 00:00:00.0.
jd2mjd	Convert Julian day to modified Julian day.
jpldate_2_datetime	Convert JPL date to datetime object.
jpldate_2_decyear	Convert JPL date to decimal year.
leap_year	Return True if year is a leap year.
mjd2cal	Convert modified Julian day to calendar date (universal time).
mjd2datetime	Convert modified Julian day to a Python datetime instance.
mjd2dayno	Convert modified Julian day to year and day of year (universal time).
mjd2decyear	Convert modified Julian day to decimal year.
mjd2gpsweek	Convert modified Julian day to GPS week and GPS day of week.
mjd2jd	Convert modified Julian day to Julian day.
seconds2datetime	Convert seconds since 1980-01-01 00:00:00 to datetime object(s).
ut2uts	Convert fractional day to seconds since 00:00:00.0.
uts2hmsmicros	Convert seconds since 00:00:00.0 (0-86400) to hours, minutes, seconds, microseconds.
uts2ut	Convert seconds since 00:00:00.0 to fractional day.
year2yr	Convert 4-digit year to 2-digit year.
yr2year	Convert two-digit year to four-digit year.