def moon_alt_az(date, moon_app_ra, moon_app_dec, obsvr_long, obsvr_lat,\
obsvr_hgt, dbg=False):
'''Calculate Moon's Azimuth, Altitude (returned in radians).
No refraction or polar motion is assumed.'''
# No atmospheric refraction...
airless = True
(temp_k, pres_mb, rel_humid, wavel, tlr) = atmos_params(airless)
# Assume no polar motion
xp = yp = 0.0
# Compute MJD_UTC
mjd_utc = datetime2mjd_utc(date)
logger.debug(mjd_utc)
# Compute UT1-UTC
dut = ut1_minus_utc(mjd_utc)
logger.debug(dut)
# Perform apparent->observed place transformation
(obs_az, obs_zd, obs_ha, obs_dec, obs_ra) = S.sla_aop(moon_app_ra, moon_app_dec,\
mjd_utc, dut, obsvr_long, obsvr_lat, obsvr_hgt, xp, yp, \
temp_k, pres_mb, rel_humid, wavel, tlr)
# Normalize azimuth into range 0..2PI
obs_az = S.sla_ranorm(obs_az)
# Convert zenith distance to altitude (assumes no depression of the horizon
# due to observers' elevation above sea level)
obs_alt = (pi/2.0)-obs_zd
logger.debug("Az, ZD, Alt=%f %f %f" % (obs_az, obs_zd, obs_alt))
return (obs_az, obs_alt)
def radec_to_azza(ra, dec, MJD, fctr=350.0, atm=1010.0, temp=283.0, humid=0.5, scope='GBT'):
"""
redec_to_azza(ra, dec, MJD):
Return AZ and ZA (in deg) from RA and DEC (J2000 in deg) at MJD. Keyword params
are fctr=350.0, atm=1010.0, temp=283.0, humid=0.5, scope='GBT'.
"""
scope, x, lon, lat, hgt = s.sla_obs(0, scope)
microns = 3e8/(fctr*1e6)*1e6
app_rarad, app_decrad = s.sla_map(ra*DEGTORAD,dec*DEGTORAD,0.0,0.0,0.0,0.0,2000.0,MJD)
az, za, hob, rob, dob = s.sla_aop(app_rarad,app_decrad,MJD,
0.0,-lon,lat,hgt,0.0,0.0,temp,atm,humid,microns,0.0065)
az = s.sla_dranrm(az)
return az*RADTODEG, za*RADTODEG
def radec_to_azza(ra,
dec,
MJD,
fctr=350.0,
atm=1010.0,
temp=283.0,
humid=0.5,
scope='GBT'):
"""
redec_to_azza(ra, dec, MJD):
Return AZ and ZA (in deg) from RA and DEC (J2000 in deg) at MJD. Keyword params
are fctr=350.0, atm=1010.0, temp=283.0, humid=0.5, scope='GBT'.
"""
scope, x, lon, lat, hgt = s.sla_obs(0, scope)
microns = 3e8 / (fctr * 1e6) * 1e6
app_rarad, app_decrad = s.sla_map(ra * DEGTORAD, dec * DEGTORAD, 0.0, 0.0,
0.0, 0.0, 2000.0, MJD)
az, za, hob, rob, dob = s.sla_aop(app_rarad, app_decrad, MJD, 0.0, -lon,
lat, hgt, 0.0, 0.0, temp, atm, humid,
microns, 0.0065)
az = s.sla_dranrm(az)
return az * RADTODEG, za * RADTODEG
