How to use the pyephem.FixedBody function in pyephem
To help you get started, we’ve selected a few pyephem examples, based on popular ways it is used in public projects.
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d_d = (d_Z*(-sin_Z*sin_lat + cos_Z*cos_lat*cos_A) \
- d_A*sin_Z*cos_lat*sin_A) / cos_d
# Convert zenith angle displacement into hour-angle component
d_H = (d_d*sin_H*sin_d - d_A*cos_A*sin_Z - d_Z*sin_A*cos_Z) \
/ (cos_H*cos_d)
return H + d_H, d + d_d
# ____ _ _ _____ _ _ ____ _
# | _ \ __ _ __| (_) ___ | ___(_)_ _____ __| | __ ) ___ __| |_ _
# | |_) / _` |/ _` | |/ _ \| |_ | \ \/ / _ \/ _` | _ \ / _ \ / _` | | | |
# | _ < (_| | (_| | | (_) | _| | |> < __/ (_| | |_) | (_) | (_| | |_| |
# |_| \_\__,_|\__,_|_|\___/|_| |_/_/\_\___|\__,_|____/ \___/ \__,_|\__, |
# |___/
class RadioFixedBody(ephem.FixedBody, RadioBody):
"""A class combining ephem's FixedBody with a RadioBody."""
def __init__(self, ra, dec, f_c=.012, name='', **kwargs):
"""ra: source's right ascension (epoch=2000)
dec: source's declination (epoch=2000)
f_c: the plasma frequency (a measure of the electron density)
in the direction of the source, which can cause the
source to appear displaced from its quiescent position
as a function of frequency."""
RadioBody.__init__(self, name=name)
ephem.FixedBody.__init__(self)
self._ra, self._dec, self.f_c = ra, dec, f_c
def compute(self, observer, refract=False):
if self.in_cache(observer, refract): return
ephem.FixedBody.compute(self, observer)
self.map = self.gen_uvw_map(observer, refract=refract)
self.cache(observer, refract)
