Create a new Epoch object. Build an epoch 1 of 2 ways: Using seconds past a Julian date: # Epoch('ET', sec=1e8, jd=2451545) or using a matplotlib day number # Epoch('ET', daynum=730119.5) = ERROR CONDITIONS - If the input units
(self, frame, sec=None, jd=None, daynum=None, dt=None)
| 22 | } |
| 23 | |
| 24 | def __init__(self, frame, sec=None, jd=None, daynum=None, dt=None): |
| 25 | """ |
| 26 | Create a new Epoch object. |
| 27 | |
| 28 | Build an epoch 1 of 2 ways: |
| 29 | |
| 30 | Using seconds past a Julian date: |
| 31 | # Epoch('ET', sec=1e8, jd=2451545) |
| 32 | |
| 33 | or using a matplotlib day number |
| 34 | # Epoch('ET', daynum=730119.5) |
| 35 | |
| 36 | = ERROR CONDITIONS |
| 37 | - If the input units are not in the allowed list, an error is thrown. |
| 38 | |
| 39 | = INPUT VARIABLES |
| 40 | - frame The frame of the epoch. Must be 'ET' or 'UTC' |
| 41 | - sec The number of seconds past the input JD. |
| 42 | - jd The Julian date of the epoch. |
| 43 | - daynum The matplotlib day number of the epoch. |
| 44 | - dt A python datetime instance. |
| 45 | """ |
| 46 | if ((sec is None and jd is not None) or |
| 47 | (sec is not None and jd is None) or |
| 48 | (daynum is not None and |
| 49 | (sec is not None or jd is not None)) or |
| 50 | (daynum is None and dt is None and |
| 51 | (sec is None or jd is None)) or |
| 52 | (daynum is not None and dt is not None) or |
| 53 | (dt is not None and (sec is not None or jd is not None)) or |
| 54 | ((dt is not None) and not isinstance(dt, DT.datetime))): |
| 55 | raise ValueError( |
| 56 | "Invalid inputs. Must enter sec and jd together, " |
| 57 | "daynum by itself, or dt (must be a python datetime).\n" |
| 58 | "Sec = %s\n" |
| 59 | "JD = %s\n" |
| 60 | "dnum= %s\n" |
| 61 | "dt = %s" % (sec, jd, daynum, dt)) |
| 62 | |
| 63 | _api.check_in_list(self.allowed, frame=frame) |
| 64 | self._frame = frame |
| 65 | |
| 66 | if dt is not None: |
| 67 | daynum = date2num(dt) |
| 68 | |
| 69 | if daynum is not None: |
| 70 | # 1-JAN-0001 in JD = 1721425.5 |
| 71 | jd = float(daynum) + 1721425.5 |
| 72 | self._jd = math.floor(jd) |
| 73 | self._seconds = (jd - self._jd) * 86400.0 |
| 74 | |
| 75 | else: |
| 76 | self._seconds = float(sec) |
| 77 | self._jd = float(jd) |
| 78 | |
| 79 | # Resolve seconds down to [ 0, 86400) |
| 80 | deltaDays = math.floor(self._seconds / 86400) |
| 81 | self._jd += deltaDays |
nothing calls this directly
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