StuartLittlefair

from astropy.coordinates import SkyCoord, EarthLocation
from astropy import units as u
from astropy.time import Time


def helio_to_bary(coords, hjd, obs_name):
    helio = Time(hjd, scale='utc', format='jd')
    obs = EarthLocation.of_site(obs_name)
    star = SkyCoord(coords, unit=(u.hour, u.deg)) 
    ltt = helio.light_travel_time(star, 'heliocentric', location=obs)

StuartLittlefair

"""
Contains some faster coordinate transformations than the ones currently used in astropy.

This is based on an idea put forward by @bwinkel in the pull request located at
at https://github.com/astropy/astropy/pull/6068. This may be merged into the astropy
master at some point. If this happens, this module can be removed.

Simply import into code to experience the speedups; the astropy coordinate transforms are
overwritten on modeul import.
"""

StuartLittlefair

from collections import OrderedDict
import copy
import operator
from astropy.time import Time


class TimeSeries:
    def __init__(self, time, data=None, **kwargs):
        if not isinstance(time, Time):
            raise ValueError('time must be an astropy Time')

StuartLittlefair

from astropy.coordinates import SkyCoord, EarthLocation
from astropy.coordinates.tests.utils import randomly_sample_sphere
from astropy.time import Time

import numpy as np

# 1000 random locations on the sky
ra, dec, _ = randomly_sample_sphere(1000)
coos = SkyCoord(ra, dec)

StuartLittlefair

from astropy import coordinates as coord
from astropy.time import Time
from astropy import units as u

lapalma = coord.EarthLocation.of_site('lapalma')
times = Time.now() + u.minute*np.linspace(-720, 720, 1440)
altaz_frame = coord.AltAz(location=lapalma, obstime=times)
sun = coord.get_body('sun', location=lapalma, time=times)
moon = coord.get_body('moon', location=lapalma, time=times)

StuartLittlefair

import numpy as np

from trm import observing
from astropy.coordinates import SkyCoord, EarthLocation
from astropy import units as u
from astropy.time import Time

from astroplan import Observer, ObservingBlock, FixedTarget
from astroplan.scheduling import (Schedule, Transitioner, TransitionBlock,
                                  PriorityScheduler, SequentialScheduler)

StuartLittlefair

from astropy import units as u
from astropy import coordinates as coord
from astropy.time import Time

from astropy.coordinates.solar_system import get_body_barycentric_posvel
from astropy.coordinates.matrix_utilities import matrix_product
from astropy.coordinates.representation import CartesianRepresentation ,UnitSphericalRepresentation
from astropy.coordinates.builtin_frames import GCRS
from astropy.coordinates import SkyCoord, solar_system, EarthLocation, ICRS
KPS = u.km/u.s

StuartLittlefair

from astropy.time import Time
from astropy.coordinates import SkyCoord, solar_system, EarthLocation, ICRS
from astropy import units as u

def velcorr(time, skycoord, location=None):
  """Barycentric velocity correction.
  
  Uses the ephemeris set with  ``astropy.coordinates.solar_system_ephemeris.set`` for corrections. 
  For more information see `~astropy.coordinates.solar_system_ephemeris`.
  

StuartLittlefair

/*global define*/
/**
 * To load this extension, add the following to your custom.js:
 *
 * require(['base/js/events'], function (events) {
 *     events.on('app_initialized.NotebookApp', function() {
 *         IPython.load_extensions('nbgrader');
 *     });
 * });
 *