TimeConstraint

class astroplan.TimeConstraint(min=None, max=None)

Bases: Constraint

Constrain the observing time to be within certain time limits.

An example use case for this class would be to associate an acceptable time range with a specific observing block. This can be useful if not all observing blocks are valid over the time limits used in calls to is_observable or is_always_observable.

Parameters:

minTime

Earliest time (inclusive). None indicates no limit.

maxTime

Latest time (inclusive). None indicates no limit.

Examples

Constrain the observations to targets that are observable between 2016-03-28 and 2016-03-30:

>>> from astroplan import Observer
>>> from astropy.time import Time
>>> subaru = Observer.at_site("Subaru")
>>> t1 = Time("2016-03-28T12:00:00")
>>> t2 = Time("2016-03-30T12:00:00")
>>> constraint = TimeConstraint(t1,t2)

Methods Summary

compute_constraint(times, observer, targets)

Actually do the real work of computing the constraint.

Methods Documentation

compute_constraint(times, observer, targets)

Actually do the real work of computing the constraint. Subclasses override this.

Parameters:

timesTime

The times to compute the constraint

observerObserver

the observaton location from which to apply the constraints

targetssequence of Target

The targets on which to apply the constraints.

Returns:

constraint_result2D array of float or bool

The constraints, with targets along the first index and times along the second.