AtNightConstraint¶

class
astroplan.
AtNightConstraint
(max_solar_altitude=<Quantity 0. deg>, force_pressure_zero=True)[source]¶ Bases:
astroplan.Constraint
Constrain the Sun to be below
horizon
. Parameters
 max_solar_altitude
Quantity
The altitude of the sun below which it is considered to be “night” (inclusive).
 force_pressure_zerobool (optional)
Force the pressure to zero for solar altitude calculations. This avoids errors in the altitude of the Sun that can occur when the Sun is below the horizon and the corrections for atmospheric refraction return nonsense values.
 max_solar_altitude
Methods Summary
compute_constraint
(times, observer, targets)Actually do the real work of computing the constraint.
twilight_astronomical
(**kwargs)Consider nighttime as time between astronomical twilights (18 degrees).
twilight_civil
(**kwargs)Consider nighttime as time between civil twilights (6 degrees).
twilight_nautical
(**kwargs)Consider nighttime as time between nautical twilights (12 degrees).
Methods Documentation

compute_constraint
(times, observer, targets)[source]¶ Actually do the real work of computing the constraint. Subclasses override this.
 Parameters
 Returns
 constraint_result2D array of float or bool
The constraints, with targets along the first index and times along the second.

classmethod
twilight_astronomical
(**kwargs)[source]¶ Consider nighttime as time between astronomical twilights (18 degrees).