U n^0@sddZddlmZddlmZddlZdZdZdZdd Zd d Z d d Z ddZ ddZ ddZ dS)aFunctions for converting between Julian dates and calendar dates. A function for converting Gregorian calendar dates to Julian dates, and another function for converting Julian calendar dates to Julian dates are defined. Two functions for the reverse calculations are also defined. Different regions of the world switched to Gregorian calendar from Julian calendar on different dates. Having separate functions for Julian and Gregorian calendars allow maximum flexibility in choosing the relevant calendar. All the above functions are "proleptic". This means that they work for dates on which the concerned calendar is not valid. For example, Gregorian calendar was not used prior to around October 1582. Julian dates are stored in two floating point numbers (double). Julian dates, and Modified Julian dates, are large numbers. If only one number is used, then the precision of the time stored is limited. Using two numbers, time can be split in a manner that will allow maximum precision. For example, the first number could be the Julian date for the beginning of a day and the second number could be the fractional day. Calculations that need the latter part can now work with maximum precision. A function to test if a given Gregorian calendar year is a leap year is defined. Zero point of Modified Julian Date (MJD) and the MJD of 2000/1/1 12:00:00 are also given. This module is based on the TPM C library, by Jeffery W. Percival. The idea for splitting Julian date into two floating point numbers was inspired by the IAU SOFA C library. :author: Prasanth Nair :contact: prasanthhn@gmail.com :license: BSD (https://opensource.org/licenses/bsd-license.php) )division)print_functionNz1.4.1g@OBAg+@cCst|dS)z$Return integer part of given number.)mathmodf)xr\/private/var/folders/sd/whlwsn6x1_qgglc0mjv25_695qk2gl/T/pip-install-4zq3fp6i/jdcal/jdcal.pyipart3sr cCs4t|d}t|d}t|d}| o2|p2| S)z+Leap year or not in the Gregorian calendar.di)rfmod)yearryzrrr is_leap8s   rcCst|}t|}t|}t|dd}td|d|d}|td|dd|d7}t|d |d }|td |d8}||d 7}|d 8}t|fS)a Gregorian calendar date to Julian date. The input and output are for the proleptic Gregorian calendar, i.e., no consideration of historical usage of the calendar is made. Parameters ---------- year : int Year as an integer. month : int Month as an integer. day : int Day as an integer. Returns ------- jd1, jd2: 2-element tuple of floats When added together, the numbers give the Julian date for the given Gregorian calendar date. The first number is always MJD_0 i.e., 2451545.5. So the second is the MJD. Examples -------- >>> gcal2jd(2000,1,1) (2400000.5, 51544.0) >>> 2400000.5 + 51544.0 + 0.5 2451545.0 >>> year = [-4699, -2114, -1050, -123, -1, 0, 1, 123, 1678.0, 2000, ....: 2012, 2245] >>> month = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] >>> day = [1, 12, 23, 14, 25, 16, 27, 8, 9, 10, 11, 31] >>> x = [gcal2jd(y, m, d) for y, m, d in zip(year, month, day)] >>> for i in x: print i (2400000.5, -2395215.0) (2400000.5, -1451021.0) (2400000.5, -1062364.0) (2400000.5, -723762.0) (2400000.5, -679162.0) (2400000.5, -678774.0) (2400000.5, -678368.0) (2400000.5, -633797.0) (2400000.5, -65812.0) (2400000.5, 51827.0) (2400000.5, 56242.0) (2400000.5, 141393.0) Negative months and days are valid. For example, 2000/-2/-4 => 1999/+12-2/-4 => 1999/10/-4 => 1999/9/30-4 => 1999/9/26. >>> gcal2jd(2000, -2, -4) (2400000.5, 51447.0) >>> gcal2jd(1999, 9, 26) (2400000.5, 51447.0) >>> gcal2jd(2000, 2, -1) (2400000.5, 51573.0) >>> gcal2jd(2000, 1, 30) (2400000.5, 51573.0) >>> gcal2jd(2000, 3, -1) (2400000.5, 51602.0) >>> gcal2jd(2000, 2, 28) (2400000.5, 51602.0) Month 0 becomes previous month. >>> gcal2jd(2000, 0, 1) (2400000.5, 51513.0) >>> gcal2jd(1999, 12, 1) (2400000.5, 51513.0) Day number 0 becomes last day of previous month. >>> gcal2jd(2000, 3, 0) (2400000.5, 51603.0) >>> gcal2jd(2000, 2, 29) (2400000.5, 51603.0) If `day` is greater than the number of days in `month`, then it gets carried over to the next month. >>> gcal2jd(2000,2,30) (2400000.5, 51604.0) >>> gcal2jd(2000,3,1) (2400000.5, 51604.0) >>> gcal2jd(2001,2,30) (2400000.5, 51970.0) >>> gcal2jd(2001,3,2) (2400000.5, 51970.0) Notes ----- The returned Julian date is for mid-night of the given date. To find the Julian date for any time of the day, simply add time as a fraction of a day. For example Julian date for mid-day can be obtained by adding 0.5 to either the first part or the second part. The latter is preferable, since it will give the MJD for the date and time. BC dates should be given as -(BC - 1) where BC is the year. For example 1 BC == 0, 2 BC == -1, and so on. Negative numbers can be used for `month` and `day`. For example 2000, -1, 1 is the same as 1999, 11, 1. The Julian dates are proleptic Julian dates, i.e., values are returned without considering if Gregorian dates are valid for the given date. The input values are truncated to integers. (@i@o i$gY@g%BA?intr MJD_0)rmonthdayajdrrrr gcal2jdCss  r"cCsPddlm}||\}}||\}}||}||}d|krHdkrVnn |d7}n2|dkrp|d7}|d8}n|dkr|d8}|d7}|d} td| d } | td | d d 8} td | dd} | td| d d8} td| d} | td| d} t| d} | dd| }d| d| | }t|t|t| |fS)aIJulian date to Gregorian calendar date and time of day. The input and output are for the proleptic Gregorian calendar, i.e., no consideration of historical usage of the calendar is made. Parameters ---------- jd1, jd2: int Sum of the two numbers is taken as the given Julian date. For example `jd1` can be the zero point of MJD (MJD_0) and `jd2` can be the MJD of the date and time. But any combination will work. Returns ------- y, m, d, f : int, int, int, float Four element tuple containing year, month, day and the fractional part of the day in the Gregorian calendar. The first three are integers, and the last part is a float. Examples -------- >>> jd2gcal(*gcal2jd(2000,1,1)) (2000, 1, 1, 0.0) >>> jd2gcal(*gcal2jd(1950,1,1)) (1950, 1, 1, 0.0) Out of range months and days are carried over to the next/previous year or next/previous month. See gcal2jd for more examples. >>> jd2gcal(*gcal2jd(1999,10,12)) (1999, 10, 12, 0.0) >>> jd2gcal(*gcal2jd(2000,2,30)) (2000, 3, 1, 0.0) >>> jd2gcal(*gcal2jd(-1999,10,12)) (-1999, 10, 12, 0.0) >>> jd2gcal(*gcal2jd(2000, -2, -4)) (1999, 9, 26, 0.0) >>> gcal2jd(2000,1,1) (2400000.5, 51544.0) >>> jd2gcal(2400000.5, 51544.0) (2000, 1, 1, 0.0) >>> jd2gcal(2400000.5, 51544.5) (2000, 1, 1, 0.5) >>> jd2gcal(2400000.5, 51544.245) (2000, 1, 1, 0.24500000000261934) >>> jd2gcal(2400000.5, 51544.1) (2000, 1, 1, 0.099999999998544808) >>> jd2gcal(2400000.5, 51544.75) (2000, 1, 1, 0.75) Notes ----- The last element of the tuple is the same as (hh + mm / 60.0 + ss / 3600.0) / 24.0 where hh, mm, and ss are the hour, minute and second of the day. See Also -------- gcal2jd rrrr?i r gAi:rrii KrP@i T@&@rrr 1rrr r)jd1jd2rjd1_fjd1_ijd2_fjd2_ijd_iflnijrrrrrr jd2gcals0C      r9cCst|}t|}t|}d|}t|dd}|td|d|d8}|td|d7}||7}|d 7}|d 8}t|fS) akJulian calendar date to Julian date. The input and output are for the proleptic Julian calendar, i.e., no consideration of historical usage of the calendar is made. Parameters ---------- year : int Year as an integer. month : int Month as an integer. day : int Day as an integer. Returns ------- jd1, jd2: 2-element tuple of floats When added together, the numbers give the Julian date for the given Julian calendar date. The first number is always MJD_0 i.e., 2451545.5. So the second is the MJD. Examples -------- >>> jcal2jd(2000, 1, 1) (2400000.5, 51557.0) >>> year = [-4699, -2114, -1050, -123, -1, 0, 1, 123, 1678, 2000, ...: 2012, 2245] >>> month = [1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12] >>> day = [1, 12, 23, 14, 25, 16, 27, 8, 9, 10, 11, 31] >>> x = [jcal2jd(y, m, d) for y, m, d in zip(year, month, day)] >>> for i in x: print i (2400000.5, -2395252.0) (2400000.5, -1451039.0) (2400000.5, -1062374.0) (2400000.5, -723765.0) (2400000.5, -679164.0) (2400000.5, -678776.0) (2400000.5, -678370.0) (2400000.5, -633798.0) (2400000.5, -65772.0) (2400000.5, 51871.0) (2400000.5, 56285.0) Notes ----- Unlike `gcal2jd`, negative months and days can result in incorrect Julian dates. r g@irig"@gt$rr)rrrr!rrrr jcal2jd+s3r<cCsDddlm}||\}}||\}}||}||}d|krHdkrVnn |d7}n2|dkrp|d7}|d8}n|dkr|d8}|d7}|d} t| dd} | d| } t| dd t| d} | d | d } td | d } | td | d }t| d } | dd| }d| | | d}t|t|t||fS)aJulian calendar date for the given Julian date. The input and output are for the proleptic Julian calendar, i.e., no consideration of historical usage of the calendar is made. Parameters ---------- jd1, jd2: int Sum of the two numbers is taken as the given Julian date. For example `jd1` can be the zero point of MJD (MJD_0) and `jd2` can be the MJD of the date and time. But any combination will work. Returns ------- y, m, d, f : int, int, int, float Four element tuple containing year, month, day and the fractional part of the day in the Julian calendar. The first three are integers, and the last part is a float. Examples -------- >>> jd2jcal(*jcal2jd(2000, 1, 1)) (2000, 1, 1, 0.0) >>> jd2jcal(*jcal2jd(-4000, 10, 11)) (-4000, 10, 11, 0.0) >>> jcal2jd(2000, 1, 1) (2400000.5, 51557.0) >>> jd2jcal(2400000.5, 51557.0) (2000, 1, 1, 0.0) >>> jd2jcal(2400000.5, 51557.5) (2000, 1, 1, 0.5) >>> jd2jcal(2400000.5, 51557.245) (2000, 1, 1, 0.24500000000261934) >>> jd2jcal(2400000.5, 51557.1) (2000, 1, 1, 0.099999999998544808) >>> jd2jcal(2400000.5, 51557.75) (2000, 1, 1, 0.75) rr#r$rrr%g@gԖ@gv@g>@r)r(r*rrr gl@r,)r-r.rr/r0r1r2r3r4r8kr5r6r7rrrrrr jd2jcalns0+       r>)__doc__ __future__rrr __version__rZ MJD_JD2000r rr"r9r<r>rrrr s'   eC