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rise_set_az.py
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executable file
·180 lines (144 loc) · 5.88 KB
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#!/usr/bin/env python3
import ephem
from ephem import cities
import argparse
import datetime
import re
import sys
# Slop allowed in phase calculation, in percent:
PHASESLOP = 5
def find_rise_set(observer, body, rise, start, end, targetaz, phase, slop):
# convert angles to radians
slop *= ephem.pi / 180
targetaz *= ephem.pi / 180
observer.date = start
while observer.date < end:
if rise:
observer.date = observer.next_rising(body)
else:
observer.date = observer.next_setting(body)
body.compute(observer)
if phase > 0:
if abs(body.phase - phase) > PHASESLOP:
continue
if abs(body.az - targetaz) < slop:
print("%s: %.1f at %d%% illuminated" % (observer.date,
body.az * 180 / ephem.pi,
body.phase))
def observer_for_city(city):
try:
return ephem.city(city)
except KeyError:
pass
try:
return cities.lookup(city)
except ValueError:
pass
# Add some cities pyephem doesn't know:
if city == 'San Jose': # San Jose, CA at Houge Park
observer = ephem.Observer()
observer.name = "San Jose"
observer.lon = '-121:56.8'
observer.lat = '37:15.55'
observer.elevation = 100
return observer
elif city == 'Los Alamos': # Los Alamos, NM Nature Center
observer = ephem.Observer()
observer.name = "Los Alamos"
observer.lon = '-106:18.36'
observer.lat = '35:53.09'
observer.elevation = 2100
return observer
elif city == 'White Rock': # White Rock, NM Visitor Center
observer = ephem.Observer()
observer.name = "White Rock"
observer.lon = '-106:12.75'
observer.lat = '35:49.61'
observer.elevation = 1960
return observer
return None
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description="""Calculate sun/moon rise/set.""")
# Required argument: the observer's location
parser.add_argument("-o", "--observer", action="store", required=True,
dest="observer", default="White Rock",
help='Observer location: city name or '
'lat(dd),lon(dd)[,elevation(m)[,name]]')
# Required argument: azimuth where the rise or set is wanted
parser.add_argument("-a", "--azimuth", action="store",
dest="az", type=int, required=True,
help='Target rise/set azimuth, in decimal degrees')
# The rest of the arguments are optional.
parser.add_argument("--moon", dest="moon", default=False,
action="store_true", help="Moon (default)")
parser.add_argument("--sun", dest="sun", default=False,
action="store_true", help="Sun (rather than moon)")
parser.add_argument("-r", "--rise", dest="rise", default=False,
action="store_true", help="Rise (default)")
parser.add_argument("-s", "--set", dest="set", default=False,
action="store_true", help="Set (rather than rise)")
parser.add_argument("-p", "--phase", action="store", default=0,
dest="phase", type=int,
help='Phase percent (default: all phases)')
parser.add_argument("--slop", action="store", dest="slop", default=1,
type=int,
help="Slop degrees allowed (default 2)")
parser.add_argument("-S", "--start", dest="start", default=None,
help="Start date, YYYY-MM-DD, "
"default: today",
type=lambda s: datetime.datetime.strptime(s,
'%Y-%m-%d'))
parser.add_argument("-E", "--end", dest="end", default=None,
help="End date, YYYY-MM-DD, "
"default: end of start year",
type=lambda s: datetime.datetime.strptime(s,
'%Y-%m-%d'))
args = parser.parse_args(sys.argv[1:])
obsparts = args.observer.split(',')
if len(obsparts) > 1:
floatexp = r"[-+]?\d*\.\d+|\d+"
try:
lat = re.findall(floatexp, obsparts[0])[0].strip()
lon = re.findall(floatexp, obsparts[1])[0].strip()
if len(obsparts) > 2:
ele = re.findall(floatexp, obsparts[2])[0].strip()
else:
ele = '0'
if len(obsparts) > 3:
obsname = ','.join(obsparts[3:]).strip()
else:
obsname = 'Custom'
print("lat", lat, "lon", lon, "ele", ele, "obsname", obsname)
observer = ephem.Observer()
observer.name = obsname
observer.lon = ephem.degrees(lon)
observer.lat = ephem.degrees(lat)
observer.elevation = float(ele)
except RuntimeError:
observer = None
else:
observer = None
if not observer:
observer = observer_for_city(args.observer)
if not observer:
print("Couldn't parse observer '%s'" % args.observer)
parser.print_help()
sys.exit(1)
print("Observer:", observer)
if args.sun:
body = ephem.Sun()
else:
body = ephem.Moon()
rise = not args.set
if rise:
print("Finding %srises" % body.name)
else:
print("Finding %ssets" % body.name)
if not args.start:
args.start = datetime.datetime.now()
if not args.end:
args.end = args.start.replace(month=12, day=31, hour=23)
vals = find_rise_set(observer, body, rise,
ephem.Date(args.start), ephem.Date(args.end),
args.az, args.phase, args.slop)