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jd.f
Go to the documentation of this file.
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function
jd
(i,j,k)
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c
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c
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c This function converts a calendar date to the corresponding Julian
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c day starting at noon on the calendar date. The algorithm used is
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c from Van Flandern and Pulkkinen, Ap. J. Supplement Series 41,
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c November 1979, p. 400.
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c
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c
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c Arguments
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c
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c Name Type I/O Description
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c ---- ---- --- -----------
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c i I*4 I Year - e.g. 1970
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c j I*4 I Month - (1-12)
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c k I*4 I Day - (1-31)
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c jd I*4 O Julian day
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c
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c external references
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c -------------------
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c none
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c
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c
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c Written by Frederick S. Patt, GSC, November 4, 1992
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c
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c
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jd
= 367*i - 7*(i+(j+9)/12)/4 + 275*j/9 + k + 1721014
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c This additional calculation is needed only for dates outside of the
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c period March 1, 1900 to February 28, 2100
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c jd = jd + 15 - 3*((i+(j-9)/7)/100+1)/4
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return
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end
jd
Definition:
jd.py:1
