ch_ephem.time

CHIME ephemeris time routines.

Time Functions

Functions

`chime_local_datetime`(*args)	Create a `datetime.datetime` object in Canada/Pacific timezone.
`parse_date`(datestring)	Convert date string to a datetime object.
`utc_lst_to_mjd`(datestring, lst[, obs])	Convert date string and LST to corresponding modified Julian Day.

ch_ephem.time.chime_local_datetime(*args: Any) → datetime[source]

Create a datetime.datetime object in Canada/Pacific timezone.

Parameters:: *args – Any valid arguments to the constructor of datetime.datetime except tzinfo. Local date and time at CHIME.
Returns:: dt – Timezone naive date and time but converted to UTC.
Return type:: datetime.datetime

ch_ephem.time.parse_date(datestring: str) → datetime[source]

Convert date string to a datetime object.

Parameters:: datestring (str) – Date as YYYYMMDD-AAA, where AAA is one of [UTC, EST, EDT, PST, PDT]
Returns:: date – A python datetime object in UTC.
Return type:: datetime.datetime

ch_ephem.time.utc_lst_to_mjd(datestring: str, lst: float, obs: Observer | None = None) → float[source]

Convert date string and LST to corresponding modified Julian Day.

Parameters:

datestring (str) – Date. The string is parsed using parse_date (q.v.).
lst (float) – Local sidereal time at the observer in decimal hours
obs (caput.time.Observer or None) – The observer. If not given, or None, the CHIME instrument will be used.

Returns:

mjd – Modified Julian Date corresponding to the given time.

Return type:

float